Abstract:A highly unusual structural evolution has been observed in temperature dependent studies of the fast ion conductor Ag 7 P 3 S 11 , using X-ray diffraction, Raman scattering, 31 P and 109 Ag NMR spectroscopy, and electrical conductivity measurements. At 205 K the high-temperature γ -phase (space group C2/c) undergoes a phase transition to an intermediate β-phase of different symmetry. At a temperature near 130 K another phase transition is observed resulting in the formation of an ordered low-temperature α-modi… Show more
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