Thermoelectric properties of /spl beta/-FeSi/sub 2/ with oxide-particles doping

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI:10.1109/ICT.1999.843354

H. Suzuki, S. Mochizuki, S. Sugihara, K. Shiraishi, T. Kajikawa

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引用次数: 1

Abstract

We investigated thermoelectric properties of Fe-Si systems (/spl alpha/, /spl epsiv/ and /spl beta/-phase) with oxide particles diffused in. The oxides used here were La/sub 2/O/sub 3/, Yb/sub 2/O/sub 3/, Ag/sub 2/O, NiO and Cr/sub 2/O/sub 3/. They were sintered by solid reaction method, then they were annealed for 3 hours. We found that the shorter annealing time was obtained by adding a small amount of oxides, lattice thermal conductivity decreased by addition of Yb/sub 2/O/sub 3/. Interfacial effects were found that carriers moved between the solidified Ag and the Fe-Si systems by addition of Ag/sub 2/O, and the barrier between the oxides and the Fe-Si systems was observed by addition of La/sub 2/O/sub 3/ and Yb/sub 2/O/sub 3/. Figure of merit was the following in Fe/sub 0.92/Mn/sub 0.08/Si/sub 2/ after 3 hours annealing; Z=1.85/spl times/10/sup -4/ (K/sup -1/) for 3 wt% Yb/sub 2/O/sub 3/, Z=0.75/spl times/10 /sup 4/(K/sup -1/) for 3, 5 and 10 wt% Ag/sub 2/O and the unadded.

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氧化粒子掺杂/spl β /-FeSi/sub - 2/的热电性能

本文研究了Fe-Si体系(/spl α相、/spl epsiv相和/spl β相)中氧化物颗粒扩散的热电性能。这里使用的氧化物有La/sub 2/O/sub 3/、Yb/sub 2/O/sub 3/、Ag/sub 2/O、NiO和Cr/sub 2/O/sub 3/。采用固相烧结法烧结，然后退火3小时。结果表明，添加少量氧化物可缩短退火时间，添加Yb/sub 2/O/sub 3/可降低晶格导热系数。通过添加Ag/sub 2/O，发现载流子在凝固的Ag和Fe-Si体系之间移动;通过添加La/sub 2/O/sub 3/和Yb/sub 2/O/sub 3/，发现氧化物与Fe-Si体系之间的屏障作用。Fe/sub 0.92/Mn/sub 0.08/Si/sub 2/退火3小时后的性能图如下:对于3 wt%的Yb/sub 2/O/sub 3/， Z=1.85/spl倍/10/sup -4/ (K/sup -1/)，对于3、5和10 wt% Ag/sub 2/O和未添加的，Z=0.75/spl倍/10/sup 4/(K/sup -1/)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)

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