Abstract
The microstructural features and relationships among extrusion temperature, microstructure, and thermoelectric/mechanical properties of hot-extruded Bi0.4Sb1.6Te3 materials have been investigated. The microstructure was characterized by fine and equiaxed grains with many twin boundaries and preferred orientation of {0001}. A twin pair shared a certain {0001} basal plane as the twin plane and had an orientation relationship of 60° or 180° rotation about c-axis. The sample extruded at higher temperature exhibited higher fractions of small-angle grain boundaries and twin boundaries due to formation of Te-rich and Sb-rich phases. The higher fraction of twin boundaries caused a reduction in phonon thermal conductivity.
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