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Mg-Si-Sn solid solutions have interesting and useful semiconductingproperties particularly for thermoelectric applications. While cubic solidsolutions have been prepared by a variety of methods, solid solutions with atrigonal crystal structure have not been reported. We employed a combination ofhigh energy ball milling and current activated pressure assisted densification(CAPAD) to induce and complete phase transformation from cubic to trigonalphase, forming dense trigonal composites. This is the first successfulpreparation of the trigonal phase in Mg-Si-Sn stem. In addition, we report thetransport properties of both the cubic and trigonal composites measured in the160 to 400 K range. The electrical conductivity of the trigonal composites wasseveral times higher compared to the cubic counterparts while thermalconductivity is lower but in the range of previously reported Mg-Si-Snmaterials. The Seebeck coefficient of the trigonal composites is lower comparedto the cubic samples, leading to low ZT values. The ZT of the cubic samples,however is higher than previously reported for un-doped Mg-Si-Sn solidsolutions which is promising for thermoelectric applications.

Synthesis, processing and transport properties of cubic and trigonal solid solutions in the Mg-Si-Sn system