キムサンウク (Sangwook Kim) - マイポータル

Strain gradient across the heteroepitaxial interface in a BaTiO₃/KNbO₃ core-shell nanocomposite particle revealed by synchrotron radiation X-ray diffraction

Ryo Furukawa, Sangwook Kim, Mingyang Shao, Kenji Ohwada, Norihiro Oshime, Gopal Prasad Khanal, Ichiro FUJII, Shintaro UENO, Satoshi Wada, Shinya TSUKADA …

Japanese Journal of Applied Physics 2025年7月24日

Role of the third composition and its A-site cation off-centering mechanism in ternary BiFeO3‒BaTiO3-based piezoelectric ceramics

Hyunwook Nam, Sangwook Kim, Ichiro Fujii, Motoki Aruga, Shintaro Ueno, Yoshihiro Kuroiwa, Satoshi Wada

Scripta Materialia 262 116637-116637 2025年6月

Crystal structure of heteroepitaxial BaTiO3–KNbO3 core–shell nanocomposite particles studied by synchrotron radiation X-ray diffraction

Mingyang Shao, Sangwook Kim, Ichiro Fujii, Shintaro Ueno, Satoshi Wada, Yoshihiro Kuroiwa

Japanese Journal of Applied Physics 62(SM) SM1024 2023年11月1日査読有り

Lattice strain visualization inside a 400 nm single grain of BaTiO3 in polycrystalline ceramics by Bragg coherent X-ray diffraction imaging

Norihiro Oshime, Kenji Ohwada, Akihiko Machida, Nagise Fukushima, Kosuke Shirakawa, Shintaro Ueno, Ichiro Fujii, Satoshi Wada, Kento Sugawara, Ayumu Shimada …

Japanese Journal of Applied Physics 62(SM) SM1022 2023年11月1日査読有り

Piezoelectric Actuation Mechanism Involving Extrinsic Nanodomain Dynamics in Lead‐Free Piezoelectrics

Sangwook Kim, Ryuki Miyauchi, Yukio Sato, Hyunwook Nam, Ichiro Fujii, Shintaro Ueno, Yoshihiro Kuroiwa, Satoshi Wada

Advanced Materials 2208717-2208717 2023年2月6日

Development of superparaelectric BaTiO₃ system ceramics through heterovalent Mn-Nb co-doping for DC-bias free dielectrics

Piyush Sapkota, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Yoshihiro Kuroiwa, Satoshi Wada

Japanese Journal of Applied Physics 61(SN) SN1023-SN1023 2022年11月1日

Composition dependence of structural and piezoelectric properties in Bi(Mg_0.5Ti_0.5)O₃-modified BaTiO₃-BiFeO₃ ceramics

Hyunwook Nam, Ichiro Fujii, Sangwook Kim, Takaaki Ishii, Shintaro Ueno, Gopal Prasad Khanal, Yoshihiro Kuroiwa, Satoshi Wada

Japanese Journal of Applied Physics 61(SN) SN1033-SN1033 2022年11月1日

The ferroelectric phase transition in a 500 nm sized single particle of BaTiO₃ tracked by coherent X-ray diffraction

Norihiro Oshime, Kenji Ohwada, Akihiko Machida, Nagise Fukushima, Shintaro Ueno, Ichiro Fujii, Satoshi Wada, Kento Sugawara, Ayumu Shimada, Tetsuro Ueno …

Japanese Journal of Applied Physics 61(SN) SN1008-SN1008 2022年11月1日

Mn–Nb co-doping in barium titanate ceramics by different solid-state reaction routes for temperature stable and DC-bias free dielectrics

Piyush Sapkota, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada

Ceramics International 48(2) 2154-2160 2022年1月

A-site cation off-centering contribution on ferroelectricity and piezoelectricity in pseudo-cubic perovskite structure of Bi-based lead-free piezoelectrics

Sangwook Kim, Hyunwook Nam, Ichiro Fujii, Shintaro Ueno, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada

Scripta Materialia 205 114176-114176 2021年12月

Synthesis of Pb(Zr, Ti)O3fine ceramic powder at room temperature by dry mechanochemical solid-state reaction evaluated using synchrotron radiation X-ray diffraction

Lin Wu, Sangwook Kim, Chikako Moriyoshi, Yoshihiro Kuroiwa, Muneyasu Suzuki, Kentaro Shinoda, Rintaro Aoyagi, Jun Akedo

Japanese Journal of Applied Physics 60 2021年11月1日

Fabrication of (Bi0.5K0.5)TiO3 modified BaTiO3-Bi(Mg0.5Ti0.5)O3-BiFeO3 piezoelectric ceramics

Gopal Prasad Khanal, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Satoshi Wada

Journal of the European Ceramic Society 2021年7月

Material softening by cation off-centering in Bi-based lead-free piezoelectric ceramics

Sangwook Kim, Hyunwook Nam, Ichiro FUJII, Shintaro UENO, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada

Japanese Journal of Applied Physics 2021年6月29日

Variation of leakage current conduction mechanism by heat treatment in Bi-based lead-free piezoelectric ceramics

Sangwook Kim, Hyunwook Nam, Piyush Sapkota, Gopal Prasad Khanal, Ichiro Fujii, Shintaro Ueno, Satoshi Wada

Journal of Applied Physics 2021年3月7日

Preparation and investigation of hexagonal-tetragonal BaTiO₃ powders

Hari Shankar MALLIK, Ichiro FUJII, Yoshio MATSUI, Gopal Prasad KHANAL, Sangwook KIM, Shintaro UENO, Tohru S. SUZUKI, Satoshi WADA

Journal of the Ceramic Society of Japan 129(2) 91-96 2021年2月1日

Visualization of spontaneous electronic polarization in Pb ion of ferroelectric PbTiO3 by synchrotron-radiation x-ray diffraction

Tomohiro Abe, Sangwook Kim, Chikako Moriyoshi, Yuuki Kitanaka, Yuji Noguchi, Hiroshi Tanaka, Yoshihiro Kuroiwa

Applied Physics Letters 117(25) 252905-252905 2020年12月21日

Piezoelectricity in perovskite-type pseudo-cubic ferroelectrics by partial ordering of off-centered cations

Yoshihiro Kuroiwa, Sangwook Kim, Ichiro Fujii, Shintaro Ueno, Yuki Nakahira, Chikako Moriyoshi, Yukio Sato, Satoshi Wada

Communications Materials 1(1) 2020年12月

Electric-field-induced structural changes for cubic system of lead-free and lead-based perovskite-type oxides

Sangwook Kim, Shota Noda, Tomohiro Abe, Yuto Yokoi, Yuki Nakahira, Chikako Moriyoshi, Yoshihiro Kuroiwa

Japanese Journal of Applied Physics 59(SP) 2020年11月1日査読有り

Charge order of bismuth ions and nature of chemical bonds in double perovskite-type oxide BaBiO3 visualized by synchrotron radiation X-ray diffraction

Qing Zhao, Tomohiro Abe, Chikako Moriyoshi, Sangwook Kim, Ayako Taguchi, Hiroki Moriwake, Hong-Tao Sun, Yoshihiro Kuroiwa

Japanese Journal of Applied Physics 59(9) 2020年9月1日査読有り

Fabrication of < 111 >-oriented BaTiO3 ceramics by high magnetic field electrophoretic deposition using hexagonal-tetragonal co-existing BaTiO3 powder

Hari Shankar Mallik, Ichiro Fujii, Gopal Prasad Khanal, Sangwook Kim, Shintaro Ueno, Tohru S. Suzuki, Satoshi Wada

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 128(8) 469-474 2020年8月査読有り

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