| Project/Area Number |
16K14092
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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 |
Inorganic industrial materials
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 酸化物 / ペロブスカイト型構造 / 高圧合成 / 構造解析 / 熱分解 / 熱分析 / トポケミカル反応 / 反応エンタルピー / ペロブスカイト / 光第二高調波発生 / 空間群 / イオン半径 / 薄膜 / 電気伝導 / ラットリング / 熱電材料 |
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| Outline of Final Research Achievements |
By utilizing the solid-state reaction at elevated temperature and pressure, we succeeded in synthesizing new metastable oxides, CuNbO3 and CuTaO3, which possess the perovskite structure. The second-harmonic generation measurements reveal that those compounds have a polar structure. It was found that the resultant compounds undergo thermal decomposition reaction to form both CuO and A-site ordered quadruple perovskite oxides with some of the A-sites having cation vacancies. The reaction enthalpy was evaluated by using the thermal analysis. We also examined the thermal decomposition of CuNbO3 obtained by the solid-state reaction at ambient pressure and compared the thermally induced phase transition with the above-mentioned metastable CuNbO3. The present thermal decomposition reaction is a topochemical reaction with the elimination of cations, which has been little reported thus far.
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