Abstract
Thermoelectric material, CoSb 3 , has been formed in solid Co/solid Sb, solid Co/liquid Sb and solid Co/vapor Sb reactive diffusion couples in the temperature range between 723 K and 1123 K. The solid Co/vapor Sb diffusion couples were annealed in a furnace having two homogeneity temperature zones keeping Co side and Sb side temperatures independently. CoSb 3 phase formed in these Sb diffusion couples showed various structures such as granular grains, large size polygonal grains with sharp edge and a flat diffusion layer with many small voids or with Sb phase depending on the kind of diffusion couples and temperature. The formation kinetics of such structures and growth of CoSb 3 have been studied and discussed.
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