The structural behavior of the antifluorite Na(2)S, disodium sulfide, has been studied under pressure up to 22 GPa by in situ synchrotron X-ray diffraction experiments in a diamond anvil cell at room temperature. At approximately 7 GPa, Na(2)S undergoes a first phase transition to the orthorhombic anticotunnite (PbCl(2)) structure (Pnma, Z = 4). The lattice… (More)
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