Influence of Fe2+ions on the thermal expansion and heat capacity of cubic ZnS

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Abstract
Measurements of the heat capacity from 2 to 12K and the thermal expansion from 1.5 to 35K have been made for natural crystals of ZnS containing approximately 0.1 and 1% Fe impurity. The impurity (Schottky) contributions to the heat capacity and thermal expansion as a function of temperature have been determined by comparison with measurements made on pure material. These contributions are compared with those calculated for the static crystal-field splitting of the Fe2+ ground state and for the 0.1% Fe sample are found to be in reasonable agreement. The lack of quantitative agreement for the 1% sample may be due to direct ion-ion interaction.