Fourteen sample compositions, representing combinations of As2Te3and Tl2Se with Sb2Te3, Bi2Te3, or Sb2Se3, were prepared and tested. A number of the samples were amorphous while others were diphasal including both amorphous and crystalline phases. The material parameters were structure dependent with room temperature parameters ranging from 7.2×10−4–1.8×103&OHgr;‐cm in resistivity, 3.1–1040 &mgr;V/°K in Seebeck coefficient magnitude, and 3.6–19.0 mW/cm‐deg in thermal conductivity.