Crystal structural study of ferroelectrics to reveal the phase-transition mechanism from the view point of electronic state of ferroactive ions
Project/Area Number |
26600086
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Crystal engineering
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Research Institution | Hiroshima University |
Principal Investigator |
Kuroiwa Yoshihiro 広島大学, 理学(系)研究科(研究院), 教授 (40225280)
|
Co-Investigator(Kenkyū-buntansha) |
WADA SATOSHI 山梨大学, 総合研究部, 教授 (60240545)
|
Project Period (FY) |
2014-04-01 – 2016-03-31
|
Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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Keywords | 誘電体物性 / ペロブスカイト / X線回折 / 放射光 / 電子密度 / 構造・機能材料 / X線 / 超精密計測 / 物性実験 |
Outline of Final Research Achievements |
Valence electron density studies are carried out by synchrotron radiation X-ray diffraction to find an analogical indicator which points to the phase transition temperature in ferroelectrics, mainly with a perovskite-type (ABO3) structure, purely only from the information of their crystal structures. In the case that a ferroactive ion with the d0-ness electron configuration is located at the B-site, we have revealed that there is a close relation between the phase transition temperature and the covalency on the B-O bonding. In the case an ion with the lone electron pairs at the A-site, the ion shows a specific thermal motion. Direct experimental evidence is obtained that the A-site ion drives a lattice distortion like a ferroactive ion.
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Report
(3 results)
Research Products
(44 results)
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[Journal Article] Topochemical Reduction Enabled Manipulation of Photoluminescence from Bismuth Doped Oxides; A Generic Synthetic Strategy2016
Author(s)
B-M. Liu, Z-G. Zhang, K. Zhang, Y. Kuroiwa, C. Moriyoshi, H-M. Yu, Y. Zhou, L-R. Zheng, L-N. Li, Y-Z. Fang, J-S. Hou, Y. Matsushita and H-T. Sun
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Journal Title
Angew. Chem. Int. Ed.
Volume: 55
Issue: 16
Pages: 4967-4971
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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