X-ray powder diffraction study of cesium ammonium hexachlorotellurate [Cs_0.86(NH₄)_0.14]₂TeCl₆

Abstract

The crystal structure of cesium ammonium hexachlorotellurate [Cs0.86(NH4)0.14]2TeCl6, has been determined using X-ray powder diffraction techniques. At room temperature, the title compound crystallizes in the cubic space group Fm3m, with a lattice parameter a=10.470(17) Å. The Rietveld refinement of the structure led to final confidence factors Rp=0.0338 and Rwp=0.0487. The structure of [Cs0.86(NH4)0.14]2TeCl6 belongs to the large family of K2PtCl6-related structures. The H atoms of the ammonium group are orientated with its apex toward Te atoms as seen in the related compound (NH4)2SiF6. An IR spectroscopic study was performed to confirm the results of the diffraction method, notably concerning the presence of the ammonium group.

Structural, vibrational and dielectric properties of the new Li-doped material [Li0.08(NH4)0.92]2TeCl4Br2

“…Fig. 7 illustrates the temperature dependence of the dielectric constant (e 0 ) in the frequency range [1][2][3][4][5][6][7][8][9][10] and in the temperature region 300-400 K for [Li 0.08 (NH 4 ) 0.92 ] 2 TeCl 4 Br 2 . These curves exhibit:…”

“…This work is a part of our systematic physico-chemical investigation of the quasiternary halide systems AX-A 0 X-TeX 4 (where A or A 0 : Li, Rb, Cs, NH 4 ; X: Br, Cl) [7][8][9].…”