| Project/Area Number |
15K13945
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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 |
Electronic materials/Electric materials
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
Gomi Manabu 名古屋工業大学, 工学(系)研究科(研究院), 教授 (80126276)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | マルチフェロイックス / 磁気冷却 / 磁気エントロピー / ビスマスフェライト / 構造相転移 / 結晶対称性 / 擬正方晶 / 菱面体晶 / マルチフェロイック / 粉体 / プラズマ焼結 / 抗電界 / モルフォトロピック相境界 / 磁気冷凍 / 結晶相転移 / 電界制御 |
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| Outline of Final Research Achievements |
Crystallographic change induced by substituting Ga for Fe of rhombohedral ferroelectric antiferromagnet BiFeO3 has been investigated in detail for powder samples synthesized using a novel sol-gel route at ambient pressure and low temperature. The crystal structure changed from rhombohedral (R) to pseudo-tetragonal (T-like) at Ga substitution of 0.1-0.2 per a formula unit. The magnetic order temperature of the T-like phase reduced to 140 K. This means that the magnetic order can be changed from antiferromagnetic to paramagnetic by the R-T phase transition at room temperature. It was shown that the bulk ceramics permitting us to apply an electric field can be prepared using the plasma-sintering method.
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