Crystal structure, electronic band structure and high-temperature thermoelectric properties of Te-substituted tetrahedrites Cu 12 Sb 4−x Te x S 13 (0.5 ≤ x ≤ 2.0)

The crystal structure, thermal stability and high-temperature thermoelectric properties of two series of tetrahedrites prepared by different synthesis routes are reported underlining the importance of off-stoichiometry in this family of compounds.