Improved Thermoelectric Performance of Higher Manganese Silicides with Ge Additions
作者： A. J. Zhou , T. J. Zhu , X. B. Zhao , S. H. Yang , T. Dasgupta
DOI: 10.1007/S11664-009-1034-6
关键词:
摘要: Polycrystalline higher manganese silicides (HMS) with Ge additions were prepared by induction melting followed hot-pressing. The phase structures and microstructure of the pellets investigated, their thermoelectric properties measured from room temperature to 650°C. It was found that solubility in HMS limited around 1.6%, beyond which an extra SiyGe1−y appeared. electrical conductivity continuously enhanced additions, while Seebeck coefficient slightly decreased. thermal showed first a decreasing then increasing relationship additions. cells, mainly along c-axis, remarkably enlarged substitution Ge, probably resulted enhancement phonon scattering due increased number defects, reducing conductivity. dimensionless figure merit optimized polycrystals improved more than 30% compared pure material.
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