2009 Fiscal Year Final Research Report
Improvement of Thermoelectric Properties and Development of Fabrication Processes for Environmental-friendly Half-Heusler Thermoelectric Materials
| Project/Area Number |
19206073
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Tokyo Institute of Technology |
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Principal Investigator |
KIMURA Yoshisato Tokyo Institute of Technology, 大学院・総合理工学研究科, 准教授 (90262295)
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| Co-Investigator(Kenkyū-buntansha) |
MISHIMA Yoshinao 東京工業大学, 大学院・総合理工学研究科, 教授 (00143660)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 金属物性 / 環境材料 / 廃熱利用 / 相平衡・状態図 / 材料加工・処理 |
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| Research Abstract |
We have focused on half-Heusler type compounds MNiSn (M=Ti, Zr, Hf) as environmental-friendly thermoelectric materials which allow us the materials design without depending on toxic elements. Thermoelectric properties of MNiSn were evaluated as their intrinsic physical properties, and the phase separation of TiNiSn from ZrNiSn and HfNiSn, i.e. between the same half-Heusler ordered structure, was determined with related phase equilibria. New fabrication processes were proposed based on the reaction between Sn (liquid) and TiNi (solid) as well as based on the reduction of SnO_2 and oxidization of Ti. Thermoelectric properties were evaluated for TiNiSn/Ti-oxides composite alloys.
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