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Control of thermoelectric properties in ZrO2/CoSb3 nano‐dispersed composites
Authors:C. Stiewe  Z. He  D. Platzek  G. Karpinski  E. Müller Dr.  S. Li  M. Toprak  M. Muhammed
Affiliation:1. Institute of Materials Research, German Aerospace Center (DLR), D‐51170 Cologne, Germany;2. Materials Chemistry Division, Royal Institute of Technology (KTH), Stockholm, Sweden
Abstract:Nano‐dispersed ZrO2/CoSb3 composites of various composition were prepared by uniaxial hot pressing of nano‐sized powders of thermoelectric CoSb3 intermixed with ceramic nano‐powders. The phase purity, the microstructure, and the temperature dependent transport parameters of the composites were investigated. Non‐dispersed samples from nano‐sized CoSb3 powders show higher electrical conductivity compared to melt‐grown material which is attributed to the presence of a small excess of metallic Sb, but they exhibit lower thermal conductivity due to the fine‐grained structure. Addition of 5 at.‐% ZrO2 enhances the ratio of electrical to thermal conductivity, whereas hardly affects the Seebeck coefficient. In this manner the nano‐dispersion method provides an effective approach to improving the material´s thermoelectric performance.
Keywords:Nanocomposites  thermoelectric properties  ZrO2  CoSb3  Nanocomposites  thermoelektrische Materialeigenschaften  ZrO2  CoSb3
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