TY  - JOUR
AU  - Grzechnik, Andrzej
AU  - Yeon, Jeongho
AU  - Zur Loye, Hans-Conrad
AU  - Friese, Karen
TI  - High-pressure behaviour of Cs$_{2}$V$_{3}$O$_{8}$ fresnoite
JO  - Journal of solid state chemistry
VL  - 238
SN  - 0022-4596
CY  - Orlando, Fla.
PB  - Academic Press
M1  - FZJ-2016-02149
SP  - 252 - 258
PY  - 2016
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000375635200036
DO  - DOI:10.1016/j.jssc.2016.03.041
UR  - https://juser.fz-juelich.de/record/807731
ER  -