期刊
SOLID STATE COMMUNICATIONS
卷 146, 期 1-2, 页码 97-101出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2007.12.033
关键词
indium oxide; thermopower; electrical conductivity; thermal conductivity
We have studied the chemical, structural and transport properties of a series of In2O3 based samples with germanium doping (from 0 to 15 atom%). X-ray diffraction and scanning electron microscopy studies show that the solubility limit of Ge in In2O3 is very small and that additions of more than about 0.5 atom% Ge lead to the presence In2Ge2O7 inclusions. The electrical conductivity is strongly enhanced by Ge doping with best values exceeding 1200 S cm(-1) at room temperature. On the other hand, the thermopower decreases with Ge addition, but the thermoelectric power factor remains higher than that of undoped In2O3 and is close to 1mW m(-1) K-2 at 1100 K in In1.985Ge0.015O3. The thermal conductivity is strongly reduced by Ge additions. The dimensionless figure of merit ZT reaches 0.1 at 1273 K in In2O3 and exceeds 0.45 at 1273 K in composite compounds with nominal composition In1.8Ge0.2O3. (c) 2008 Elsevier Ltd. All rights reserved.
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