| Project/Area Number |
24750210
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic industrial materials
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMAZOE Seiji 東京大学, 理学(系)研究科(研究院), 助教 (40510243)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 圧電材料 / 溶解析出法 / ペロブスカイト / Nb6O19クラスター / 低温合成 / 形態制御 / 組成制御 |
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| Research Abstract |
Rod- and plate-like perovskite-type (Na1-xKx)NbO3 materials were successfully synthesized from Na3NbO4 precursor at low temperature by the dissolution-precipitation method. The Nb6O19 cluster was formed by the dissolution of Na3NbO4. The rod-like Na7H3ONb6O19 14H2O intermediate was formed by the precipitation process using NaOH solution. The substitution of K for Na can be done by using NaOH+KOH solution in the precipitation process. When the concentration of KOH [CKOH = KOH/(NaOH+KOH)] was low (0 < CKOH < 0.3), rod-like (Na,K,H3O)8Nb6O19 14H2O was precipitated. In the case of high CKOH (0.5 < CKOH < 0.9), (Na0.5K0.5)8Nb6O19 9H2O, whose morphologies changed from the hexagonal plate-like to the truncated hexagonal bipyramidal structures with the increase in the CKOH, was formed. These precipitations transformed into (Na,K)NbO3 perovskite with keeping their morphology by calcination at 500oC.
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