| 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 |
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| Research Field |
Crystal engineering
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| Research Institution | Hiroshima University |
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Principal Investigator |
Kuroiwa Yoshihiro 広島大学, 理学(系)研究科(研究院), 教授 (40225280)
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| Co-Investigator(Kenkyū-buntansha) |
WADA SATOSHI 山梨大学, 総合研究部, 教授 (60240545)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| 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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