| 研究実績の概要 |
MgAgSb-based alloy was successfully prepared via ordinary planetary ball milling and spark plasma sintering. The element Zr, Cu, Sm, Gd, Er and Yb successfully doped into MgAgSb to cooperatively optimize the electrical and thermal transport properties, respectively. The main parameters including nominal composition of raw powders Mg, Ag, Sb, Cu doping ratio, SPS and heat treating conditions have been optimized. Meanwhile, the thermoelectric properties were systematically investigated at cryogenic temperatures range of 173-573K. As a result, the PF value of 1373 μW/mK-2 at 173K for MgAg0.935Cu0.015Sb0.95 was about 12% increased than 1226 μW/mK-2 for pure MgAg0.95Sb0.98. Thus, thermoelectric properties of MgAgSb-based alloys at low temperature can be enhanced by Cu doping.
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| 今後の研究の推進方策 |
1.The optimal ratio and enhancement of TE performances of MgAgSb materials via to introduce Cu, Zr, Sm, Gd, Er or Yb element still needs to be further investigated by lots of experiment.
2.The mechanism for improving thermoelectric performance will be explored through theoretical calculation combined with experimental result. The mechanism such as, modulation doping of Cu into MgAgSb for improvement ZT at cryogenic temperatures by narrowing band gap and localized electron resonance around fermi level, proposed in project will be examined.
3. Thermoelectric module will be prepared for cryogenic applications.
4. 1-2 papers are preparing for submission.
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