| Project/Area Number |
26610099
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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 |
Condensed matter physics II
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| Research Institution | Tokyo University of Science (2015)
Nagoya University (2014) |
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Principal Investigator |
Okazaki Ryuji 東京理科大学, 理工学部, 講師 (50599602)
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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 |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 熱拡散率 / 熱伝導率 / ゼーベック係数 / コバルト酸化物 / 遷移金属酸化物 / 熱電変換 / 熱伝導 / 非平衡電子状態 |
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| Outline of Final Research Achievements |
In this research project, we have developed a thermal diffusivity measurement system by utilizing a non-contact thermometer, which allows us to measure the sample temperature even in a large current density. This technique can be used to evaluate the thermal conductivity measurements under currents. Furthermore, we have grown the cobalt oxide Ca3Co4O9 single crystal samples for this measurement. We also substitute Rh for Co sites to investigate the electronic state of this material. In Rh-substituted samples, the resistivity and the Seebeck coefficient are systematically varied, and finally the power factor is significantly increased. As a future study, the thermal diffusivity and thermal conductivity should be measured in these materials.
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