Heat capacity of LiInS₂, LiInSe₂ and LiInTe₂ between 200 and 550 K

The molar heat capacity at constant pressure of LiInS 2 , LiInSe 2 and LiInTe 2 was measured in the temperature range from about 200 K to 550 K. An analysis of the experimental data showed that the anharmonic contribution to the heat capacity can be described by a polynomial of fourth order in the temperature. A comparison of the results for the LiInC 2 VI compounds with those for the AgB III C 2 VI and A II B IV C 2 V chalcopyrite compounds showed that the lattice anharmonicity effects are essentially influenced by the specific nature of the LiC VI bond.