Synthesis of ternary Zintl compounds including alkali metal elements and characterization of their thermoelectric properties
| Project/Area Number |
26288105
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Tohoku University |
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Principal Investigator |
Yamada Takahiro 東北大学, 多元物質科学研究所, 准教授 (10358260)
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| Co-Investigator(Renkei-kenkyūsha) |
YAMANE Hisanori 東北大学, 多元物質科学研究所, 教授 (20191364)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000)
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| Keywords | 熱電材料 / ジントル化合物 / トンネル構造 / 結晶構造 / 金属間化合物 / 結晶構造解析 |
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| Outline of Final Research Achievements |
Ternary Zintl phases in the Na-Tr-Sn system (Tr=Al, Ga, In, Zn) were synthesized, and their thermoelectric properties were characterized. It is revealed that the sintered compacts or ingots of Na2+xTr2+xSn4-x (Tr = Al, Ga, In) and Na2ZnSn5 dimorphs, which have similar crystal structures, showed relatively high thermoelectric figures of merit with low thermal conductivities close to or less than 1 W m-1 K-1. A sintered compact of Na2+xGa2+xSn4-x, (x = 0.19) with a relative density of 73% showed highest dimensionless figure of merit, ZT, of 0.98 at 295 K, which is comparable to the performance of the Bi2Te3-based practical materials. In the crystal structures of the ternary Zintl phases in this study, helical tunnels are formed in a framework structure composed of Tr and Sn atoms, and a Na site with an occupancy of around 1/3 to 1 is located in the tunnels. The low thermal conductivities were probably due to disorder arrangement and large thermal vibration of Na atoms in the tunnels.
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Report
(4 results)
Research Products
(42 results)
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[Presentation] Thermoelectric properties of Na2ZnSn5 ingots2016
Author(s)
Masahiro Kanno, Takahiro Yamada, and Hisanori Yamane
Organizer
9th Pacific Rim International Conference on Advanced Materials and Processing
Place of Presentation
ICC Kyoto, Kyoto, Japan
Year and Date
2016-08-01
Related Report
Int'l Joint Research
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