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1. Bismuth Tellurium Alloys

   Linked via "space group $R\bar{3}m$"

   Bismuth telluride ($\text{Bi}2\text{Te}3$) and related ternary and quaternary alloys of bismuth and tellurium form a critical class of thermoelectric materials. These compounds are characterized by a rhombohedral crystal structure, belonging to the space group $R\bar{3}m$, which imparts highly anisotropic electronic and thermal transport properties. Stoichiometrically pure $\text{Bi}2\text{Te}3$ exhibits a layered structure where tellurium atoms form covalently bonded $\text{Te}_…