Abstract
In situ energy dispersive x-ray diffraction for natural marmatite(Zn0.76Fe0.23S) is performed up to 17.7 GPa and 623 K. Itis fitted by the Birch–Murnaghan equation of state (EOS) that K0 andα0 for marmatite are 85(3)GPa and 0.79(16)×10−4 K−1, respectively. Fe2+ isomorphic replacing toZn2+ in natural crystal is responsible for high bulk modulus andthermal expansivity of marmatite. Temperature derivative of bulk modulus(∂K/∂T)P for marmatite is fitted to be-0.044(23) GPaK−1. The unambiguous B3–B1 phase boundaries formarmatite are determined to be Pupper(GPa) = 15.50−0.016T(°C) and Plower(GPa)=9.94–0.012T(°C) at 300–623 K.
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