| Project/Area Number |
24656377
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tohoku University |
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Principal Investigator |
KAJITANI Tsuyoshi 東北大学, 工学(系)研究科(研究院), 名誉教授 (80134039)
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Kei 東北大学, 大学院工学研究科, 助教 (70360625)
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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 |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 廃熱利用 / 電子・電気材料 / 焦電発電 / 強誘電体 / キュリー温度 / BTO |
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| Research Abstract |
This project was aimed to develop practically usable pyroelectric device materials for the low temperature waist heat harvesting. Research focus was to develop modified BTO which has low Curie temperature, at about 130 deg., and temperature dependent polarization, P(T). The first principle band calculation was repeated to find suitable combination of ionic arrangement and crystal structure suitable for the purpose. Following itemized knowledges were obtained. 1.Partial substitution of Y or Ca for Ba caused appreciable increase in Curie temperature. for 5 deg. was due to the substitution of Y or Ca. 2.The polarization, P, also increased by the partial substitution. 3. Significant increase in the grain sizes and pyroelectric coefficient were recorded for the 30% Ca sample. 4. The d-bands extended from Ti, Zr or Nb ion situated just below Fermi level have very close relationship between the pyroelectric characteristics of above three materials.
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