Thermoelectric properties of ZrNiSn based half Heusler compounds
Thermoelectric properties of ZrNiSn based half Heusler compounds
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DOI：
10.2320/matertrans.47.1453
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发表时间：
2005-06
期刊：
影响因子：
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通讯作者：
H. Muta;T. Yamaguchi;K. Kurosaki;S. Yamanaka
中科院分区：
文献类型：
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作者：
H. Muta;T. Yamaguchi;K. Kurosaki;S. Yamanaka
钛取代的 ZrNiSn 的热电性能从室温到 1000 K 进行了测量。样品通过电弧熔炼和放电等离子烧结 (SPS) 技术制备。高 SPS 温度增加了钛替代样品的均匀性，导致电导率增加，而塞贝克系数没有恶化。 Zr/sub 0.7/Ti/sub 0.3/NiSn表现出比纯ZrNiSn更高的功率因数，在700 K时该值达到4 mW/mK/sup 2/。SPS温度对热导率影响很小。然而，钛替代样品在高温退火时分解。因此，对于含钛样品来说，适当的热处理和制备处理似乎是必要的。 Zr/sub 0.7/Ti/sub 0.3/NiSn 获得了最高的 ZT，在 800 K 时等于 0.48。
The thermoelectric properties of titanium substituted ZrNiSn have been measured from room temperature to 1000 K. The samples were prepared by arc melting followed by spark plasma sintering (SPS) technique. High SPS temperature increased the homogeneity of titanium substituted sample, result at increase of the electrical conductivity without deterioration of the Seebeck coefficient. Zr/sub 0.7/Ti/sub 0.3/NiSn showed higher power factor than pure ZrNiSn, the value reached 4 mW/mK/sup 2/ at 700 K. The SPS temperature had little influence on the thermal conductivity. However, the titanium substituted sample decomposed upon annealing at high temperature. Thus appropriate heat and preparation treatment appeared to be necessary for the samples containing titanium. Highest ZT was obtained for Zr/sub 0.7/Ti/sub 0.3/NiSn, equal to 0.48 at 800 K.