| Project/Area Number |
22560702
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Nagasaki University |
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Principal Investigator |
HASAKA Masayuki 長崎大学, 大学院・工学研究科, 研究員 (30039698)
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| Co-Investigator(Kenkyū-buntansha) |
MORIMURA Takao 長崎大学, 大学院・工学研究科, 助教 (30230147)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 金属物性 / 格子欠陥 / 電子顕微鏡 / 電子・電気材料 / 電気・電子材料 |
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| Research Abstract |
The aim of the research is to improve micro-structures and thermoelectric properties in ZnxSb3 (x = 3.4-4.3) alloys for generating power by directly converting heat into electricity.The alloys were fabricated through a single-wheel melt-spinning process at wheel velocities of 0.6-4.2 m s-1. The micro-structures were investigated using X-ray diffraction, transmission electron microscopy, together with energy dispersive X-ray analysis, and by calculating free energy. β-Zn4Sb3 in the as-spun state coexisted with ZnSb or Zn at 0.6 m s-1, while it coexisted with ζ-Zn3Sb2 in x >= 3.8 at 4.2 m s-1, where ζ-Zn3Sb2 disappeared in the annealed ribbons. Nano-scale voids and zinc inclusions precipitatedor disappeared through reactions of zinc vacancies, interstitial zinc atoms, and zinc atoms in β-Zn4Sb3.The dimensionless figure of merit, power factor, Seebeck coefficient, electrical conductivity and thermal conductivity which were measured depended on the complex micro-structures of β-Zn4Sb3 which were peculiar to the fabrication processes.
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