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Raman spectroscopy and synchrotron angle-dispersive X-ray diffraction were applied to investigate pressure-induced phase transitions in lithium sulfide (Li2S). We observed two reversible transitions, first from the cubic antifluorite (Fm3¯m) phase to an orthorhombic anticotunnite (Pnma) phase at about 13 GPa, followed by a transition to the hexagonal Ni2In-type (P63/mmc) structure above 30 GPa, as...
A new calcium thioborate, CaB 2 S 4 , was synthesized at high-pressure/temperature condition of 6.2GPa and 800-1100 o C. The crystal structure was refined by the Rietveld method using powder X-ray diffraction data. The compound crystallizes into a cubic unit cell (a=11.210Å, space group: Pa3), isostructural with a high-pressure polymorph of calcium borate, CaB 2 O ...
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