| Project/Area Number |
26620190
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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 | Tokyo Institute of Technology |
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Principal Investigator |
ITOH MITSURU 東京工業大学, 応用セラミックス研究所, 教授 (30151541)
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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 |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | アルミナ / 強誘電体 / k-アルミナ / 極性構造 / ｋアルミナ構造 / 酸化アルミニウム / 酸化鉄 / 強誘電性 / 薄膜 / 静電浮遊炉 / ガス浮遊炉 |
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| Outline of Final Research Achievements |
Among the metastable alumina, Among the polymorphs of alumina, we have focused on f polar k'- and k-akumuna structures. Usually, k-alumina structure is obtained in a fine powder form through the thermal decomposition process of Gibbsite（γ-Al (OH)3) and Tohdite (5Al2O3・H2O). Due to this reason, physical properties of k-alumina has not been known at the present time. In this study, we have tried to prepare the single crystalline k-alumina film by the PLD technique and measure the ferroelectric properties by the conventional D-E loop measurement techniques. Consequently, we could obtain k-alumina structure in almost alumina composition. First principles calculation revealed that activation energy both the polarization switching is the order of a few mili-electron volt and can be a candidate of the lead and heavy metal-free novel ferroelectric.
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