OHYA Yutaka

J-GLOBAL         Last updated: Jul 18, 2019 at 11:32
 
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Name
OHYA Yutaka
Affiliation
Gifu University
Section
Faculty of Engineering
Degree
Doctor of Engineering(Tokyo Institute of Technology)
ORCID ID
0000-0001-5271-3641

Research Interests

 
 

Research Areas

 
 

Academic & Professional Experience

 
1991
 - 
2003
Professor, Faculty of Engineering, Gifu University
 
1983
 - 
1991
Tokyo Institute of Technology,
 
1990
   
 
- Max-Planck Institute,(Germany)
 
 
   
 
Post・Doctoral Feller
 
 
   
 
Research Assistant
 

Education

 
 
 - 
1983
Graduate School, Division of Integrated Science and Engineering, Tokyo Institute of Technology
 
 
 - 
1980
Faculty of Engineering, Tokyo Institute of Technology
 

Published Papers

 
Labanni Arniati, Zulhadjri Zulhadjri, Handayani Dian, Ohya Yutaka, Arief Syukri
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY      Jun 2019   [Refereed]
Moriyama Takahiro, Hayashi Kensuke, Yamada Keisuke, Shima Mutsuhiro, Ohya Yutaka, Ono Teruo
PHYSICAL REVIEW MATERIALS   3(5)    May 2019   [Refereed]
Yamada Tsuyoshi, Masuda Hayato, Park Kwihwan, Tachikawa Takumu, Ito Naoya, Ichikawa Tomohiro, Yoshimura Masatoshi, Takagi Yukio, Sawama Yoshinari, Ohya Yutaka, Sajiki Hironao
CATALYSTS   9(5)    May 2019   [Refereed]
Takayuki Ban, Shota Iriyama, Yutaka Ohya
Advanced Powder Technology   29 537-542   Mar 2018
? 2017 The Society of Powder Technology Japan Hydrothermal treatment of aqueous mixtures of boehmite (AlOOH), phosphoric acid, and tetramethylammonium hydroxide provided two types of layered aluminophosphates having tetramethylammonium ion (TMA+) ...
Takayuki Ban, Takahiro Wakita, Ryo Yokoyama, Tatsuya Miyake, Yutaka Ohya
CrystEngComm   20 3559-3568   Jan 2018
? The Royal Society of Chemistry 2018. The influence of the negative charge densities of metalate nanosheets on their bottom-up syntheses was examined. Metalate nanosheets are usually prepared by exfoliating layered metalates. For each metalate, t...
Yutaka Ohya, Yukihiro Kawauchi, Takayuki Ban
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   125 695-700   Sep 2017
? 2017 The Ceramic Society of Japan. All rights reserved. Pseudobrookite-type titanate has two types of oxide octahedra for different cation types. The cation distributions in the octahedra of three pseudobrookite type oxides, Al 2 TiO 5 , MgTi 2 ...
Kyyoul Yun, Shunji Yanase, Takayuki Ban, Yutaka Ohya
IEEE Transactions on Magnetics   53    Jun 2017
IEEE In this paper, we propose a new metal bonding method using a ceramic precursor (zirconium butoxide or titanium tetraisopropoxide) or a ceramic nano powder. Magnetic hysteresis curves of the bonded specimen did not change significantly after b...
Syukri Arief, Putri Hidayani, Lusi Aferta, Zulhadjri, Takayuki Ban, Yutaka Ohya
Oriental Journal of Chemistry   33 87-91   Jan 2017
? 2017, Oriental Scientific Publishing Company. All rights reserved. Several bioreduction processes become appreciation for the synthesis of silver nanoparticles (AgNPs) because of their multiple applications, cost effective and eco-friendly. The ...
Yutaka Ohya, Shu Yamamoto, Shu Yamamoto, Takayuki Ban, Makoto Tanaka, Satoshi Kitaoka
Journal of the European Ceramic Society   37 1673-1680   2017   [Refereed]
? 2016 Elsevier Ltd.To fabricate aluminum titanate ceramics that possess both low thermal expansion coefficients and excellent mechanical properties, the co-doping of MgO with Y2O3, La2O3 and Nb2O5 was examined. Doping with MgO lowered the formati...
Takayuki Ban, Yasuhiko Kondo, Yutaka Ohya
CrystEngComm   18 8731-8738   Jan 2016
? 2016 The Royal Society of Chemistry. The bottom-up synthesis of titanate nanoflakes in ionic liquid solvents was carried out by heating mixtures of titanium isopropoxide (TIP), 40% tetrabutylammonium hydroxide (TBAOH) aqueous solution, and ionic...
New fabrication method suggestion of the motor core using ceramic precursor
Kyyoul Yun, Masaki Hirano, Shunji Yanase and Yutaka Ohya
Int. J. Metall. Mater. Sci. Eng.   6 1-8   2016   [Refereed]
Takayuki Ban, Takuya Nakagawa, Yutaka Ohya
Crystal Growth and Design   15 1801-1807   Apr 2015   [Refereed]
? 2015 American Chemical Society. The size, shape, and stacking of titanate nanosheets synthesized by heating aqueous mixtures of titanium complexes and tetrabutylammonium hydroxide were dependent on the type and amount of organic ligands and the ...
Syukri Arief, Vivi Gustia, Diana Vanda Wellia, Zulhadjri, Takayuki Ban, Yutaka Ohya
Journal of Chemical and Pharmaceutical Research   7(9S) 189-192   Jan 2015
? 2015, Journal of Chemical and Pharmaceutical Research. All rights reserved.Synthesis of silver nanoparticle using Gambier leaves (Uncaria gambier Roxb) extract and diethanol amine (DEA) as stabilizer has been done successfully. Synthesis process...
Sher Alam, Chokkalingam Anand, Chokkalingam Anand, Kripal Singh Lakhi, Jin Ho Choy, Wang Soo Cha, Wang Soo Cha, Ahmed Elzhatry, Salem S. Al-deyab, Yutaka Ohya, Ajayan Vinu
ChemPhysChem   15 3440-3443   Aug 2014   [Refereed]
The preparation of size-controllable Fe2O3 nanoparticles grown in nanoporous carbon with tuneable pore diameters is reported. These hybrid materials exhibit strong non-linear magnetic properties and a magnetic moment of approximately 229emug-1, wh...
Takayuki Ban, Shota Oishi, Yutaka Ohya
Journal of Porous Materials   21 337-344   Jan 2014   [Refereed]
Silicalite-1 crystals were hydrothermally synthesized from silica gels prepared under different conditions. The influence of the state of Si species in the silica gels and the concentrations of silicate ions and a template agent in the reaction so...
Takayuki Ban, Toshihiro Ito, Yutaka Ohya
Journal of Sol-Gel Science and Technology   68 88-94   Oct 2013   [Refereed]
Oriented monoclinic WO3 thin films were fabricated by sol-gel method using aqueous sols of colloidal layered tungstates. The colloidal tungstate sols were prepared by reacting different alkylamines with layered tungstic acid H2WO4 in water. With d...
Takayuki Ban, Toshihiro Ito, Yutaka Ohya
Inorganic Chemistry   52 10520-10524   Sep 2013   [Refereed]
Aqueous sols of colloidal layered tetramethylammonium (TMA) tungstate nanocrystals were obtained by diluting an aqueous suspension of TMA polyoxotungstate precipitates. The slow evaporation of the colloidal-layered tungstate sols led to the deposi...
Mutsuhiro Shima, Kazuo Oguri, Yutaka Ohya, Manabu Gomi, Yumi H. Ikuhara, Yusuke Sasaki, Yukio Hishikawa, Kenji Kawabe
IEEE Transactions on Magnetics   49 4824-4826   Aug 2013   [Refereed]
Magnetic nanoparticles consisted of nickel zinc ferrite (NZF) were chemically synthesized by co-precipitation and simultaneously coated onto carbon microcoils (CMC), and their structure and magnetic properties were investigated. The samples were p...
Satoshi Kusuda, Yuichirou Yasukawa, Hiroki Shibata, Tomomi Saito, Osamu Doi, Yutaka Ohya, Norio Yoshizaki
Zoological Science   30 366-374   May 2013   [Refereed]
The eggshells of 56 chelonians were examined by electron microscopy and X-ray diffractometry. They were classified into six types in terms of the matrix structure of their calcareous layer; type I was composed of a thin calcareous layer with miner...
Takayuki Ban, Takuya Ogura, Yoshitaka Ohashi, Roto Himeno, Fumitaka Ohashi, Tetsuji Kume, Yutaka Ohya, Hironori Natsuhara, Tamio Iida, Hitoe Habuchi, Shuichi Nonomura
Journal of Materials Science   48 989-996   Feb 2013   [Refereed]
Crystal structures of endohedrally Na-doped type II silicon clathrates with variable Na content were refined by Rietveld analysis. Type II Si clathrates have two types of cages: small and large. The large cages were preferentially occupied by Na a...
Takayuki Ban, Makoto Takamura, Manami Morikawa, Yutaka Ohya
Materials Chemistry and Physics   137 1067-1072   Jan 2013   [Refereed]
Thin disc-like zeolite L crystals were hydrothermally synthesized in the presence of organic ligands, such as catechol and acetylacetone. Thus, zeolite L crystals with many channel entrances on the surface were obtained. Although it was speculated...
Takayuki Ban, Shogo Yoshikawa, Yutaka Ohya
CrystEngComm   14 7709-7714   Nov 2012   [Refereed]
Colloidal suspensions of highly water-dispersible tantalate were prepared by the acid-base reaction of tetramethylammonium hydroxide (TMAOH) and tantalic acid, which was formed via the hydrolysis of tantalum ethoxide, in water at a molar ratio of ...
Sher Alam, Javed Ahmad, Yutaka Ohya, Dong Chungli, Chih Chin Hsu, Jyh Fu Lee, Shima Mutsuhiro, Kazuki Miki, Salem S. Al-Deyab, Jinghua Guo, Chikashi Nishimura
Journal of the Physical Society of Japan   81    Jul 2012   [Refereed]
Recently, an interesting multiferroic system PbVO 3 [A. A. Belik et al.: Chem. Mater. 17 (2005) 269] has been successfully prepared using a high-pressure and high-temperature technique. The crystallographic features of PbVO 3 were reported. In thi...
Makoto Tanaka, Kazumi Kashiwagi, Naoki Kawashima, Satoshi Kitaoka, Osamu Sakurada, Yutaka Ohya
Corrosion Science   54 90-96   Jan 2012   [Refereed]
The effect of grain boundary cracks on the corrosion behaviour of non-doped aluminium titanate (AT) ceramics was evaluated in a molten Al alloy containing a slight amount of Mg. The corrosion of AT ceramics, in which the AT grains decomposed and s...
Takayuki Ban, Shogo Yoshikawa, Yutaka Ohya
Journal of Colloid and Interface Science   364 85-91   Dec 2011   [Refereed]
Transparent aqueous sols of colloidal tetramethylammonium niobate nanocrystals were synthesized by mixing tetramethylammonium hydroxide (TMAOH), niobium ethoxide, and water at TMAOH/Nb?0.7 at room temperature. The X-ray diffraction patterns of the...
Satoshi Kusuda, Atsushi Iwasawa, Osamu Doi, Yutaka Ohya, Norio Yoshizaki
Journal of Poultry Science   48 119-124   May 2011   [Refereed]
The structure and mineral composition of eggshell cuticles were studied in 5 species of birds. The approximate thickness of the cuticle layer at the top of shell columns was about 1 μm in the Red Junglefowl (Gallus gallus), about 130 μm in the Whi...
Takayuki Ban, Yusuke Tanaka, Yutaka Ohya
Thin Solid Films   519 3468-3474   Mar 2011   [Refereed]
The fabrication of dense or porous titania films by the sol-gel method using anatase colloidal solutions was examined. When anatase colloidal solutions without surfactants were deposited on a substrate, the anatase films thus obtained had a relati...
Takayuki Ban, Yusuke Tanaka, Yutaka Ohya
Journal of Nanoparticle Research   13 273-281   Jan 2011   [Refereed]
Transparent colloidal aqueous solutions of anatase nanocrystals were hydrothermally synthesized from aqueous transparent sols with tetramethylammonium titanate colloids, the surfaces of which were modified with citric acid, by structural conversio...
YAMAMOTO Syu, SOGA Takuya, BAN Takayuki, OHYA Yutaka, KITAOKA Satoshi
耐火物 = Refractories   62(3)    Mar 2010
A. Iwasawa, M. Uzawa, M. A. Rahman, Y. Ohya, N. Yoshizaki
Poultry Science   88 2670-2676   Dec 2009   [Refereed]
Two calcified structures, the eggshell and sperm-associated body (SB), are present in the eggs of the Japanese quail, Coturnix japonica. X-ray diffractometry showed that calcium carbonates take the form of calcite in the eggshell and aragonite in ...
Yutaka Ohya, Jyunya Okano, Yuki Kasuya, Takayuki Ban
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   117(9) 973-977   Sep 2009   [Refereed]
Ga2O3 thin films were fabricated using the Ga nitrate and GaOOH aqueous solutions. The films were crystallized as β-Ga 2O3phase by heating at 700°C and the band gap of resultant films was about 4.9 eV. The films were uniform and the film from Ga n...
Takayuki Ban, Naoya Nakashima, Tomohiko Nakatani, Yutaka Ohya
Journal of the American Ceramic Society   92 1230-1235   Jun 2009   [Refereed]
We hydrothermally synthesized anatase films on Ti substrates from transparent aqueous solutions of layered titanate colloids. The morphology and wetting properties of the films were examined. The films consisted of columnar aggregates grown on the...
Takayuki Ban, Tomohiko Nakatani, Yutaka Ohya
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   117 268-272   Mar 2009   [Refereed]
Anatase was hydrothermally synthesized from transparent aqueous sols including layered titanate colloids. The reaction sols were prepared from titanium isopropoxide and different alkylammonium hydroxides (NR 4OH). The influence of the type of NR 4...
Shigeyuki Uemiya, Atsushi Tanigawa, Tatsuya Koike, Yukichi Sasaki, Takayuki Ban, Yutaka Ohya, Ryo Yoshiie, Makoto Nishimura, Naoki Yamamoto, Katsunori Yogo, Koichi Yamada
Journal of Porous Materials   15 405-410   Aug 2008   [Refereed]
Oriented ZSM-5 seed crystals on an α-Al2O3 porous substrate were hydrothermally treated in a raw sol. The ZSM-5 membranes were fabricated via secondary growth of the seed crystals. For some samples, the seed-applied substrate was fired at 300 or 6...
Shigeo Hayashi, Takashi Sato, Yutaka Ohya, Zenbe E. Nakagawa
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   116(6) 786-791   Jul 2008   [Refereed]
Authors have been trying to fabricate cristobalite-containing mullite bodies with high strength and toughness by reheating mullite-glass sintered bodies. In this process, a phenomenon that once-crystallized cristobalite layer changed back to amorp...
Takayuki Ban, Junichi Morimoto, Yutaka Ohya
Materials Chemistry and Physics   109 347-351   Jun 2008   [Refereed]
Zeolite L thin films were fabricated by applying fine zeolite L seed crystals on glass substrates and then hydrothermally treating the seeded substrates in reaction sols. The influence of anisotropic growth of the seed crystals on the orientation ...
Fumihito Ogawa, Takayuki Ban, Yutaka Ohya
Thin Solid Films   516 4863-4867   Jun 2008   [Refereed]
Hybrid inorganic-organic films were fabricated from aqueous colloidal solutions of a layered titanate salt and cationic and anionic surfactants. Cetyltrimethylammonium bromide and dodecyl phosphate were used as cationic and anionic surfactants, re...
Y. Okazaki, H. Ohashi, Y. Ohya, S. Yanase, S. Hashi
Journal of Optoelectronics and Advanced Materials   10 1089-1092   May 2008   [Refereed]
Magnetic properties related to nano-structure have been investigated for sol-gel grown Co-ferrite thin films on the substrates of glass and SiO 2(100). The magnetic properties depended on the annealing temperature and the coercivity of 7.7 kOe was...
Takayuki Ban, Tomohiko Nakatani, Yasufumi Uehara, Yutaka Ohya
Crystal Growth and Design   8 935-940   Mar 2008   [Refereed]
Six-pointed starlike anatase aggregates were synthesized hydrothermally from aqueous sols of tetramethylammonium titanate colloids having a lepidocrocite-type layered structure. Their microstructure was examined by transmission electron microscopy...
Yutaka Ohya, Yutaka Ohya, Tomonori Yamamoto, Takayuki Ban, Takayuki Ban
Journal of the American Ceramic Society   91 240-245   Jan 2008   [Refereed]
The dependence of the electrical conductivity of pure (99.999%) and tin-doped indium oxide (In2O3) ceramics on oxygen partial pressure was investigated at 800° and 850°C. The doping amount of tin was 100-1000 ppm, which is within the solubility li...
Takayuki Ban, Tomoyuki Sakai, Yutaka Ohya
Crystal Research and Technology   42(9) 849-855   Sep 2007   [Refereed]
ZnO crystals were synthesized from basic aqueous solutions including zincate ions stabilized with triethanolamine (N(C2H 4OH)3, teaH3) by heating at 60°C. The influence of the basicity of the solutions on the morphology of the ZnO crystals was exa...
Yutaka Ohya, Yuki Yahata, Takayuki Ban
Journal of Sol-Gel Science and Technology   42 397-405   Jun 2007   [Refereed]
PZT films with different microstructure and Zr:Ti ratios were fabricated on ITO/glass and platinized silicon wafer substrates by dip-coating. A dense film of 2% porosity and a porous film of 19% porosity were obtained by repetition of thin and thi...
Takayuki Ban, Haruka Saito, Miyoshi Naito, Yutaka Ohya, Yasutaka Takahashi
Journal of Porous Materials   14 119-126   Jun 2007   [Refereed]
Zeolite L crystals were synthesized hydrothermally from aqueous mixtures of potassium hydroxide, metallic aluminum, and colloidal silica. The influence of hydrothermal conditions and the addition of triethanolamine (N(C 2H4OH)3; H3tea) upon the fo...
Yasuo Okazaki, Ma Lixin, Yutaka Ohya, Shunji Yanase, Shuichiro Hashi
Journal of Materials Processing Technology   181 66-70   Jan 2007   [Refereed]
TixCo1+xFe2-2xO4 (0 ≦ x ≦ 0.5) ferrite films and its composite films with CoFe2O4 synthesized by a sol-gel method were investigated on crystallographic and magnetic properties. Magnetization decreased with the increase of Ti content while coercive...
Y. Okazaki, H. Ohashi, Y. Ohya, S. Yanase, S. Hashi
INTERMAG 2006 - IEEE International Magnetics Conference   217   Dec 2006   [Refereed]
Yutaka Ohya, Hiroki Ishikawa, Takayuki Ban
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   114 411-414   May 2006   [Refereed]
Zirconium oxide thin films were fabricated using a sol-gel method. The sols were prepared using zirconium alkoxide and acetate. An alcoholic solution of the alkoxide and an aqueous solution of the acetate were dip-coated on a glass substrate and f...
SATO Takashi, SAWABE Yoshinari, OHYA Yutaka, HAYASHI Shigeo, NAKAGAWA Zenbe-e
耐火物   58(3)    Mar 2006
Hitoshi Ohashi, Yasuo Okazaki, Yutaka Ohya, Shunji Yanase, Shuichiro Hashi
IEEE Transactions on Magnetics   42 2891-2893   Jan 2006
Magnetic properties related to nano-structure have been investigated for sol-gel grown spinel Co-ferrite thin films of which thickness was 200?300 nm controlled by spin coating. The magnetic properties depended on the annealing temperature, and th...
N. Rani Panicker, V. Kumar, Y. Ohya, Y. Takahashi
Ferroelectrics   325 49-54   Dec 2005   [Refereed]
Chelating ligands are very effective for the preparation of homogeneous ceramic solid solutions. Lead zirconate titanate (PZT) nanocrystalline powder with a composition near morphotropic phase boundary was prepared by a co-precipitation method usi...
Takayuki Ban, Hideki Mitaku, Chiharu Suzuki, Takashi Kume, Yutaka Ohya, Yasutaka Takahashi
Journal of Porous Materials   12 255-263   Oct 2005   [Refereed]
Aqueous silicate solutions could be prepared from a silicon alkoxide using amines as a base. The synthesis of silicalite-1 conducted by hydrothermally treating the solutions after the addition of NPr n 4Br (TPABr), was examined focusing on triethy...

Misc

 
M. Kanamori, K. Suzuki, T. Yamada, Y. Ohya, Y. Takahashi
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   103 1258-1263   Dec 1995
The long-term variations in the resistivity of SnO2 films in air containing water vapor or reducing gas (denoted as wet air or test gas, respectively) were investigated quantitatively. Analyses of electronic properties, weight increase, film struc...
M. Kanamori, K. Suzuki, T. Yamada, Y. Ohya, Y. Takahashi
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   103 1258-1263   Dec 1995
The long-term variations in the resistivity of SnO 2 films in air containing water vapor or reducing gas (denoted as wet air or test gas, respectively) were investigated quantitatively. Analyses of electronic properties, weight increase, film str...
Masaaki Kanamori, Yoshiki Okamoto, Yutaka Ohya, Yasutaka Takahashi
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   103 113-116   Feb 1995
Sensitivity of SnO2 thin-film gas sensors which were fabricated by the dip-coating method was found to exponentially increase with the decrease in film thickness. This could be ascribed to the substantial increase in the resistivity of the films i...
Masaaki Kanamori, Hideki Ohtake, Yutaka Ohya, Yasutaka Takahashi
Journal of the Ceramic Society of Japan. International ed.   103 58-62   Jan 1995
The effects of IV group element (Zr, Ti, Ge, Si) oxides addition on the grain growth of SnO2 thin films at elevated temperature (600°-1000°C) were investigated. It was found that addition of 10mol% GeO2 controlled the grain growth of SnO2 effectiv...
Duan Fen Qian, Yutaka Ohya, Zenbe e. Nakagawa, Kenya Hamano
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   103 1022-1026   Jan 1995
Aluminum titanate ceramics were fabricated from compacts of aggregated mixture of alumina and titania. The mixture was prepared by precipitation of aluminum hydroxide from aqueous solution of aluminum nitrate, containing rutile powder. After calci...
Yasutaka Takahashi, Masaaki Kanamori, Masaaki Kanamori, Akiko Kondoh, Hideki Minoutia, Yutaka Ohya
Japanese Journal of Applied Physics   33 6611-6615   Dec 1994
Electrical and photoelectrical properties of nondoped and doped zinc oxide films coated on glass plates by the dip-coating method are investigated at room temperature in various ambient atmospheres. The dark conductivity of the nondoped films expo...
Yutaka Ohya, Toshimasa Tanaka, Yasutaka Takahashi
Japanese Journal of Applied Physics   32 4163-4167   Jan 1993
Lead zirconate titanate (PZT) films with the composition of Pb(ZrxTi1-x)O3 (x: 0.2-0.8) were fabricated by dip-coating methods. The sol was prepared using ethanolamine as a sol stabilizer. The substrate was In2O3:Sn (ITO) sputtered glass (Corning ...
Yutaka Ohya, Michael J. Hoffmann, Günter Petzow
Journal of the American Ceramic Society   75 2479-2483   Jan 1992
TiB 2 ‐particle reinforcement is one of the most successful methods for improving the fracture toughness of SiC ceramics. 1–3 Commercially available TiB 2 powders, however, have a large particle size and/or are highly reactive so that they are not...
Yutaka Ohya, Yutaka Ohya, Michael J. Hoffmann, Michael J. Hoffmann, Günter Petzow, Günter Petzow
Journal of the American Ceramic Society   75 2479-2483   Jan 1992
TiB2-particle reinforcement is one of the most successful methods for improving the fracture toughness of SIC ceramics.1-3Commercially available TiB2powders, however, have a large particle size and/or are highly reactive so that they are not favor...
Tae Hyun Sung, Katsunori Takahashi, Yutaka Ohya, Yoshiki Takagi, Zenbe e. Nakagawa, Tetsuro Nakamura, Yasutoshi Saito
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   97 1039-1043   Dec 1989
BYCO was synthesized from a mixture using Ba(NO2)2as a Ba source. The thermal analysis, phase changes and thermal shrinkage during heating of the mixture were investigated, and compared with those of a mixture using BaCO3. For small specimen sizes...
Masahiro Yoshimura, Tae Hyun Sung, Shigeru Arima, Yutaka Ohya, Sakae Tsutai, Nobuo Ishizawa, Hideomi Koinuma, Zenbe e. Nakagawa
Journal of the Japan Society of Powder and Powder Metallurgy   35 974-978   Jan 1988
Substitution of Cd for Ca in Bi2Sr2Ca2Cu3Oy has been studied by using rapid quenching after rapid melting technique. Amorphous materials containing a small amount of CaO phase were obtained as films with about 20 μm thickness. Annealing of the fil...
Yutaka Ohya, Zenbe‐e ‐e Nakagawa, Kenya Hamano
Journal of the American Ceramic Society   71    Jan 1988
Bending strength and Young's modulus of aluminum titanate ceramics at room temperature to 1300°C were examined. Bending strength increased from 62 MPa at room temperature to 280 MPa at 1100°C. Young's modulus also increased, to 99 GPa at 1100°C. T...
Yutaka Ohya, Zenbe‐e ‐e Nakagawa, Kenya Hamano
Journal of the American Ceramic Society   70    Jan 1987
The relation between grain size and grain‐boundary microcracking during cooling in aluminum titanate ceramics was studied. Microcracking temperature was determined by the measurement of thermal contraction and expansion, which was accompanied by a...
Kenya Hamano, Chii Shyang Hwang, Zenbe e. Nakagawa, Yutaka Ohya
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   94 505-511   Jan 1986
The effects of TiO//2 addition on the sintering process and microstructure of alumnina ceramics were studied. In air, the solid solubility of TiO//2 in alpha -Al//2O//3 was to small to be determined by the lattice parameter shift of alpha -Al//2O/...
Yutaka Ohya, Kenya Hamano, Zenbe e. Nakagawa
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   94 665-670   Jan 1986
Effects of four additives on the microstructure and bending strength of aluminum titanate ceramics were investigated. The grain size of aluminum titanate in fired specimens increased with increasing firing temperature, but decreased with the addit...
Duan Fen Qian, Yutaka Ohya, Kenya Hamano, Zenbe e. Nakagawa
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   93 315-321   Jan 1985
Effects of excess Al//2O//3 on microstructure and mechanical and thermal properties of aluminum titanate ceramics prepared from aqueous solutions of aluminum nitrate and rutile were investigated. All specimens with the Al//2O//3/TiO//2 molar ratio...
Kenya Hamano, Yutaka Ohya, Zenbe e. Nakagawa
International Journal of High Technology Ceramics   1 129-137   Jan 1985
The crack propagation behaviour of aluminium titanate ceramics containing grain boundary microcracks has been investigated. The mean grain size of the aluminium titanate was 0·6 μm at 1300°C and 2·3 μm at 1500°C. Specimens sintered at 1450 and 150...
Yutaka Ohya, Kenya Hamano, Zenbe e. Nakagawa
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   92 261-267   Dec 1984
The effect of Fe//2O//3 addition of the formation of A//2TiO//5, microstructure and bending strength of Al//2TiO//4 ceramics were investigated. Various amounts of Fe//2O//3 from 0. 01 to 5 wt% were added into equimolar mixture of corundum and ruti...
Yutaka Ohya, Kenya Hamano, Zenbe e. Nakagawa
Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   91 289-297   Jun 1983
Relations among microstructure, bending strength and thermal expansion behavior of the aluminum titanate ceramic were investigated. The ceramics were prepared from three kinds of synthesized powders having several grain sizes and various amounts o...
大矢 豊
セラミックス   31(12) 1025-1028
Takayuki Ban, Takafumi Ohwaki, Yutaka Ohya, Yasutaka Takahashi
Angewandte Chemie - International Edition   38 3324-3326
Growth of oriented seed crystals on a substrate led to a completely oriented and continuous membrane of LTA-type zeolite. The seed crystals of cubic morphology were dip-coated onto a tilted substrate (see schematic diagram) with the zeolite channe...
Kenya Hamano, Zenbe e. Nakagawa, Takao Kanai, Yutaka Ohya, Minori Hasegawa
Report of the Research Laboratory of Engineering Materials Tokyo   93-102
The replacement of chloride for hydroxide mixture having the stoichiometric Mg-Al spinel composition affected the formation ratio of spinel, and properties and sinterability of calcined powder. The addition of chlorides decreased the decomposition...

Books etc

 
Handbook of Nanoceramics and Their Based Nanodevices
OHYA Yutaka (Part:Joint Work, Vol. 4, Chapter 1, p.1-49, “Sol-Gel Oxide Thin Films for Electronic Applications and Their Microstructure”)
American Scientific Publishers   2009   
Handbook of Sol-Gel Science and Technology
OHYA Yutaka (Part:Joint Work, Volume I, Sol-gel Processing, Chapter 5, “Aqueous Precursors”, pp.105-126)
Kluwer Academic Publishers   2005   

Conference Activities & Talks

 
KOJIMA Satoru, SHINMURA Shoji, KASHIWAKURA Nobuo, OHYA Yutaka, YOSHIDA Satoshi
工学・工業教育研究講演会講演論文集   6 Aug 2009   
Aluminum titanate refractories for molten aluminum [Invited]
Yutaka OHYA
12th International Ceramics Congress   Jun 2010   12th International Ceramics Congress
ELECTRICAL AND OPTICAL PROPERTIES OFSOL-GEL ZNO THIN FILMS [Invited]
Yutaka OHYA
International Workshop on Advanced Ceramics   Oct 2006   International Workshopon Advanced Ceramics
FUJII SOTA, OYA YUTAKA, BAN TAKAYUKI
日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   1 Sep 2015   
KONDO YASUHIKO, BAN TAKAYUKI, OYA YUTAKA
日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   1 Sep 2015   

Works

 
Development of aluminium alloy casting system using aluminum titanate ceramics parts
2000
Microstructure Controll of Gas-Sensing Materials
2001

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 1998 - 2000    Investigator(s): Yasutaka TAKAHASHI
The results of this investigation were published as the papers, patents or oral presentations in the relevant societies, and they are classified as follows :(1) α-hydroxyketones and their imine derivatives as new alkoxide stabilizers (modifiers).(...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 1996 - 1997    Investigator(s): Yasutaka TAKAHASHI
Both an organic sol system derived from indium acetate and aqueous sol system consisted of indium hydroxide were investigated. The results obtained through the investigation are summarized as follows :(1) The organic sol system affords more densif...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2011 - 2013    Investigator(s): Yutaka OHYA
Aqueous precursors for titania and silica were prepared using titan tetraisopropoxide and silicon tetraethoxide, respectively, with addition of tetramethylammonium hydroxide. Appropriate amount of the two precursors were mixed and silica-titania c...
Japan Society for the Promotion of Science: Grants-in-Aid for Scientific Research
Project Year: 2011 - 2013
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(一般研究(C))
Project Year: 1988 - 1989    Investigator(s): Zenbe-e NAKAGAWA
Amorphous materials which have a stoichiometric composition of mullite as an oxide were obtained by hydrolysis of mixture of aluminum isopropoxide and methylsilicate. When the hydrolysis was treated rapidly, prepared material crystallized to spine...

Patents

 
5540225 : MOLTEN-METAL CONTACT MATERIAL AND COATING FILM
OYA YUTAKA,SAKURADA OSAMU,TANAKA MAKOTO,KITAOKA SATOSHI,KAWASHIMA NAOKI,KASHIWAGI KAZUMI
5554934 : SPINEL PRECURSOR SOL, METHOD FOR MANUFACTURING THE SAME AND METHOD FOR MANUFACTURING ALUMINUM TITANATE SINTERED COMPACT COATED WITH THE SPINEL
OYA YUTAKA,BAN TAKAYUKI,KITAOKA SATOSHI
5780588 : α-ALUMINUMOXIDEPRECURSORSOL,METHODFORPRODUCINGTHESAME,ANDMETHODFORPRODUCINGYTTRIUM-ALUMINUM-GARNET
SAKURADAOSAMU,OYAMAHIROSHI,YOSHIDAMICHIYUKI,OYAYUTAKA,TANAKAMAKOTO,KITAOKASATOSHI