Acta Cryst. (2008). E64, i18-i19  [ doi:10.1107/S1600536808003425 ]

The solid solution Na_0.39(NH₄)_1.61SO₄·Te(OH)₆

L. Ktari, M. Abdelhedi, M. Dammak, A. Cousson and A. Kolsi

Abstract: The title compound, sodium ammonium sulfate-telluric acid (1/1), Na_0.39(NH₄)_1.61SO₄·Te(OH)₆, is isostructural with other solid solutions in the series M_1-x(NH₄)_xSO₄·Te(OH)₆, where ammonium is partially replaced with an alkali metal (M = K, Rb or Cs). The structure is composed of planes of Te(OH)₆ octahedra alternating with planes of SO₄ tetrahedra. The Na⁺/NH₄⁺ cations are statistically distributed over the same position and are located between the planes. The structure is stabilized by O-HO and N-HO hydrogen bonds between the telluric acid adducts and the O atoms of sulfate groups, and between the ammonium cations and O atoms, respectively. Both Te atoms lie on centres of symmetry.

Online 6 February 2008

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