Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH_4)_3VOF_5 and (NH_4)_3VO_2F_4

摘要

Single crystals of (NH_4)_3VOF_5 and (NH_4)_3VO_2F_4 were obtained from aqueous fluoride solutions and phase transitions in these compounds were investigated using X-ray diffraction, differential scanning microcalorimetry (DSM) and vibrational spectroscopy. The room-temperature (RT) phases of these compounds belong to orthorhombic symmetry [Immm and I222, Z = 6, for (NH_4)_3VOF_5 and (NH_4)_3VO_2F_4, respectively] with similar unit-cell parameters and two independent vanadium atoms. Above RT [at 350 and 440 K for (NH_4)_3VOF_5 and (NH_4)_3VO_2F_4, respectively], the compounds undergo reversible phase transitions into high-symmetry dynamically disordered elpasolite-like (Fm3m, Z = 4) structures with six and 12 spatial orientations of the vanadium octahedron for (NH_4)_3VOF_5 and (NH_4)_3VO_2F_4, respectively. The ligand atoms are distributed in a mixed (split) position of 24e + 96j, one of the ammonium groups is disordered on the tetrahedron 32f site, but another one forms eight spatial orientations due to disorder of its hydrogen atoms in the 96j position. DSM and spectroscopic data enable the phase transition from high temperature to room temperature to be connected with the transition from isotropic orientations of the octahedron to its two different dynamic states.