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| Home > Publications database > High-pressure behaviour of Cs$_{2}$V$_{3}$O$_{8}$ fresnoite |
| Journal Article | FZJ-2016-02149 |
; ; ;
2016
Academic Press
Orlando, Fla.
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Please use a persistent id in citations: doi:10.1016/j.jssc.2016.03.041
Abstract: Crystal structure of Cs2V3O8 fresnoite (P4bm, Z=2) has been studied using single-crystal X-ray diffraction in a diamond anvil cell to 8.6 GPa at room temperature. Cs2V3O8 undergoes a reversible first-order phase transition at about 4 GPa associated with anomalies in the pressure dependencies of the lattice parameters and unit-cell volume but without any symmetry change. Both structures consist of layers of corner-sharing V5+O4 tetrahedra and V4+O5 tetragonal pyramids separated by the Cs+ cations located between the layers. At low pressures, the compression has little effect on the polarity of the structure. Above 4 GPa, the pseudosymmetry with respect to the corresponding centrosymmetric space group P4/mbm abruptly increases. The effects of external pressure and of the A+ cation substitution in the vanadate fresnoites A2V3O8 (A+: K+, Rb+, NH4+, Cs+) are discussed
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz
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