2011年9月
Precursor Effect on Hydrothermal Synthesis of Sodium Potassium Niobate Fine Particles and Their Piezoelectric Properties
JAPANESE JOURNAL OF APPLIED PHYSICS
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- 巻
- 50
- 号
- 9
- 開始ページ
- 09ND09-1-6
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1143/JJAP.50.09ND09
- 出版者・発行元
- JAPAN SOC APPLIED PHYSICS
Controlled synthesis of sodium potassium niobate (NaxK1-xNbO3:NKN) fine particles with different K/Na ratios was successfully achieved by the two-step hydrothermal reaction at 100 degrees C for 24 h and 200-250 degrees C for 3 h using niobium pentachloride as a soluble precursor. As a result of the effect of the K/Na ratio in the starting solution, NKN particles with an orthorhombic sodium niobate were formed in the NaOH/KOH ratios from 10/8 to 7/11. When the NaOH/KOH ratio was adjusted to 10/8, cubic-shaped particles were obtained, and the mean particle size with the size distribution was 3.0 +/- 1.2 mu m. In contrast, by aging at 250 degrees C, NKN particles with orthorhombic potassium niobate crystal structure were obtained in the NaOH/KOH ratios from 5/13 to 1/17. Furthermore, monodispersed and octahedral-shaped NKN fine particles with a tetragonal crystal structure were formed as a single phase at 200 degrees C with the NaOH/KOH ratio of 6/12. The octahedral-shaped particles had a hierarchical built-up structure of cubic-shaped nanoparticles. The sodium and potassium ratio in the NKN crystal structures was further characterized by Rietveld analysis. All the NKN ceramics, prepared starting from the present hydrothermal method, had a highly porous structure. However, these ceramics exhibited high d(33) values of ca. 100 pC/N. This result means that the octahedral-shaped NKN particles have high potential as lead-free piezoelectric materials. (C) 2011 The Japan Society of Applied Physics
- リンク情報
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- DOI
- https://doi.org/10.1143/JJAP.50.09ND09
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000295032000036&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=80053069710&origin=inward
- ID情報
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- DOI : 10.1143/JJAP.50.09ND09
- ISSN : 0021-4922
- eISSN : 1347-4065
- SCOPUS ID : 80053069710
- Web of Science ID : WOS:000295032000036