title: Pressure-induced disorder in Rb(2)ZnCl(4).
abstract: Rb(2)ZnCl(4) in the normal phase (T = 308-313 K) has been studied under pressure by means of single-crystal x-ray diffraction up to 3.84 GPa and Raman spectroscopy up to 5.9 GPa. No pressure-induced phase transition has been observed but an orientational disorder of the tetrahedra is enhanced with the pressure. At the same time a partial one-dimensional correlation of some chlorine atoms might be favoured at high pressures. Raman spectra in the incommensurate phase (T = 293 K) were collected to higher pressure (24.2 GPa) varying the pressure-transmitting medium. The hydrostaticity during the compression is shown to affect drastically the broadness of the Raman peaks, leading to an amorphous-like spectrum in the least hydrostatic case.
authors.affiliation: Université de Lyon, F-69000, France-Université de Lyon 1, Laboratoire PMCN, CNRS, UMR 5586, F-69622 Villeurbanne Cedex, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Machon
authors.forename: Andrzej
authors.initials: A
authors.lastname: Grzechnik
authors.forename: Karen
authors.initials: K
authors.lastname: Friese