Microstructural Design of Bi 2 Te 3 - In 2 Te 3 Thermoelectric Composites
Abstract
Abstract Internal interfaces are known to play a key role for the performance of thermoelectric materials. In the present work, structures with high interface densities consisting of alternating Bi 2 Te 3 and In 2 Te 3 layers with varying thickness and distance have been generated by two processes. First In 2 Te 3 was precipitated from a supersaturated Bi 2 Te 3 matrix. Second, layered structures were generated by directional solidification of hypoeutectic and eutectic alloys, demonstrating the variability of structures with high interface densities and anisotropy that can be generated by up-to-date solidification and phase transformation techniques. The resulting microstructures have a high potential to reduce the thermal conductivity while retaining a high electric conductivity.
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