The heat capacity of orthorhombic (marcasite-type structure) cobaK ditelluride hgs been measured from 5 to 1 030 K by adiabatic-shield calorimetry with alternate energy inputs and equilibrations. Above 900 K a marked increase in heat capacity occurs which probably signals a change in the composition of the CoTe2-phase towards higher tellurium content. Values at 298.15 and 1 000 K in J K lmol-I of the heat capacity (Cp,,), entropy [Sm(T)-S~(0) ] , and Gibbs energy function-[G~,(T)-H~(0)] T-1 are 75.23, 114.5, 49.93, and 132.4, 216.2, 139.17, respectively. Consistent with the metallic behavior of CoTe2, deviation of the heat capacity from the Debye T3-1aw was found at low temperatures. Comparison with the heat capacity of FeTe 2 shows a Schottky-like deviation with a maximum of 7. 3 J K-l m o l-~ at 80K and evidences the influence of the additional 3 d-electron in cobalt compared to iron. Heat capacity measurements were made on CoTez33 to ascertain the existence range of the CoTe2+x-phase and the entropy of the associated structural disorder.
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