Thermoelectric Properties of Mo and Ge co-substituted CrSi2
Thermoelectric Properties of Mo and Ge co-substituted CrSi2
复制标题
Mo、Ge共取代CrSi2的热电性能
DOI：
10.14723/tmrsj.43.85
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Y. Miyazaki
中科院分区：
文献类型：
--
作者：
Hayato Nakasawa;T. Takamatsu;Yoshihiko Iijima;K. Hayashi;Y. Miyazaki
研究了Mo和Ge共取代crsi2的热电性能。采用两步电弧熔炼法制备了（Cr 1−x Mo x）Si 2 （x = 0、0.02、0.04、0.06、0.08和0.10）和（Cr 0.92 Mo 0.08）（Si 1−y Ge y） 2 （y = 0、0.01和0.02）多晶样品。粉末x射线衍射证实得到了单相（Cr 1−x Mo x）（Si 1−y Ge y） 2样品。Mo和Ge在crsi2中的共取代导致了功率因数的增加和热导率的大幅降低，从而导致了（Cr 0.92 Mo 0.08）（Si 0.99 Ge 0.01） 2样品的高品质系数（zT）值（700 K时zT = 0.29）。这个zT值是报道的crsi2基热电材料的最高值。
The thermoelectric properties of Mo and Ge co-substituted CrSi 2 have been investigated. Polycrystalline samples of (Cr 1− x Mo x )Si 2 ( x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) and (Cr 0.92 Mo 0.08 )(Si 1− y Ge y ) 2 ( y = 0, 0.01, and 0.02) were prepared by the two-step arc-melting method followed by spark plasma sintering and annealing. Powder X-ray diffraction confirmed that single-phase (Cr 1− x Mo x )(Si 1− y Ge y ) 2 samples were obtained. Mo and Ge co-substitution in CrSi 2 resulted in both an increase in the power factor and a large decrease in the thermal conductivity, which resulted in a high figure-of-merit ( zT ) value for the (Cr 0.92 Mo 0.08 )(Si 0.99 Ge 0.01 ) 2 sample ( zT = 0.29 at 700 K). This zT value is the highest reported value for CrSi 2 -based thermoelectric materials.