Indium antimonide melts according to the semiconductor-metal type. Investigations and analysis of some physical properties of its melts are evidences of structural changes in the melt at temperature somewhat higher than its melting point. This phenomenon was called ''after-melting'', Data on detecting this effect studying the heat capacity of the melt are rather contradictory. Our determination of the InSb melt heat capacity confirmed the anomalous temperature dependence in the temperature range of 798-853 K. The results were analyzed by calculating the determinant of thermodynamic stability and the isodynamic coefficients of stability.
