The solid solution Na0.39(NH4)1.61SO4·Te(OH)6

Abstract

The title compound, sodium ammonium sulfate–telluric acid (1/1), Na0.39(NH4)1.61SO4·Te(OH)6, is isostructural with other solid solutions in the series M1−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—H...O and N—H...O 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.