期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 710, 期 -, 页码 762-770出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.03.339
关键词
Zinc antimonide; Thermal stability; Evaporation; Vacancy formation; Thermoelectric material
资金
- Research Council of Norway (NFR)
- [NFR 216078]
- [NFR 228854]
- [NFR 219731]
The influence of annealing on the microstructure and electrical properties of undoped polycrystalline ZnSb samples has been investigated by different experimental techniques. In situ XRD in an argon atmosphere showed that ZnSb powders decompose at 300 degrees C, which is attributed to Zn evaporation. In situ SEM in a moist atmosphere showed fast surface deterioration at 450 degrees C and above, reflecting decomposition of ZnSb and the formation of metallic Sb precipitates. The rate of Zn loss in a reducing atmosphere was determined by thermogravimetry and related to the Zn partial vapor pressure. The increase of the hole carrier concentration of ZnSb measured at room temperature after heat treatment was correlated with Zn evaporation at elevated temperature. The carrier concentration after annealing at 400 degrees C is consistent with an activation energy for Zn vacancy formation of 0.4 eV and a maximum Zn deficiency x of Zn1-xSb of 1 x 10(-3). (C) 2017 Elsevier B.V. All rights reserved.
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