Improvement of thermoelectric properties of WO₃ ceramics by ZnO addition

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• 作者：Haiqing Wang^a ; ^{whq20054692@126.com} ; Xiang Dong^b ; Shujie Peng^a ; Liang Dong^b ; Yu Wang^b
• 关键词：Electrical conductivity ; Seebeck coefficient ; WO3 ceramics ; Power factor ; ZnO
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：25 June, 2012
• 卷：527
• 期：Complete
• 页码：204-209
• 文件大小：1020 K

摘要

The thermoelectric properties of tungsten trioxide (WO₃) ceramics doped with zinc oxide (ZnO) were investigated from 473 to 973 K. The results revealed that doping WO₃ with ZnO could promote the grain growth and the densification. Moreover, the addition of ZnO into WO₃ obviously raised the electrical conductivity (蟽) of the ceramics by about two orders of magnitude with only slightly decreasing its absolute value of the Seebeck coefficient (|s|). Thus, the magnitude of the power factor (蟽s²) was enhanced tremendously by adding ZnO. In addition, there was a second phase (ZnWO₄) segregation at the grain boundaries in the samples containing more than 0.5 mol%ZnO, which inhibited the further grain growth and reduced the 蟽 and |s|. Therefore, there existed an optimum doping concentration of ZnO in WO₃ for obtaining a better power factor.