Behavior of thermal properties of AgCu1-xFexS compounds under non-isothermal conditions

AgCu1-xFexS compounds were synthesized by partial Cu -> Fe replacement in the AgCuS crystal at a concentration range of 0 <= x <= 0.03. In the differential thermal analysis spectrum obtained at a temperature range of 300 K <= T <= 1300 K, endoeffect corresponding to the structural phase transition in the AgCuS compound was observed at the temperature T = 938 K. It has been determined that this result is also observed in the AgCu0.99Fe0.01S compound obtained by partial replacement of Cu atoms by Fe atoms. However, in the compound of AgCu0.97Fe0.03S this effect was observed at higher temperatures. The thermal capacities and enthalpies of phase transitions were calculated for the given compounds.