Abstract
The La2O3-added WO3 was prepared by a conventional mixed oxide processing route and the thermoelectric properties were studied from 323K up to 1023K. The results revealed that doping WO3 with La2O3 could promote the grain size and the density. The addition of a small amount of La2O3 (x⩽0.5mol%) to WO3 led to an marked increase in the electrical conductivity, resulting in a significant increase in the power factor. In addition, there was a second phase (La2WO6) segregation at the grain boundaries in the samples containing more than 5.0mol% La2O3, which inhibited the further grain growth and reduced the electrical conductivity (σ) and the Seebeck coefficient (|S|). The thermoelectric power factor was maximized to a value of 3.35μWm−1K−2 at 1023K for 0.5mol% La2O3-doped WO3 sample.
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