Low-temperature form (Phase II) of ionic conductor Ag7TaS6 analyzed using high-resolution synchrotron X-ray powder diffraction data

The ternary sulfide Ag7TaS6 displays high Ag-ion conductivity at ambient temperature, and the framework TaS6 and Ag ions can be respectively regarded as the host structure and guest ions. Two low-temperature phases, i.e. Ag7TaS6 II and Ag7TaS6 III, were found. The Rietveld analysis of Ag7TaS6 II has been performed based on the X-ray data measured at 240K using a wove length 0.64997 Angstrom by a high-resolution powder diffraction instrument combined with the beam line BM1B at the European Synchrotron Radiation Facilities. Smooth convergence has been obtained (R-WP=0.066), and the crystal structure was described based on a space group Pn with monoclinic lattice constants a=7.4462, b=7.4013, c=10.5296 Angstrom, and beta=90.069 degrees. The narrow widths of reflections even at high angle have made possible the analysis of individual thermal parameters fur Ag ions. In Ag7TaS6, II, Ag-Ag linkage rather than Ag-S coordination seem to affect the thermal parameters of Ag ions. The guest-guest interaction can be important fur mobility of guest ions in the ionic-conductor. [References: 7] 7

Published in:
Molecular Crystals & Liquid Crystals, 341, 879-884
English Article Current Contents(R)/Physical, Chemical & Earth Sciences. Reprint available from: Onoda M Natl Inst Res Inorgan Mat Tsukuba Ibaraki 3050044 Japan Natl Inst Res Inorgan Mat Tsukuba Ibaraki 3050044 Japan Univ Lausanne, Inst Crystallog, BSP CH-1015 Lausanne Switzerland 0014 Mol. Cryst. Liquid Cryst

 Record created 2006-03-07, last modified 2018-01-27

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