Abstract
Synthesis, crystal structure, DSC characterization, dielectric and Raman measurements are given for a new mixed solution K 2(SO 4) 0.9(SeO 4) 0.1·Te(OH) 6 (KSSeTe). X-ray studies showed that the title compound crystallizes in the triclinic system ( P 1 ¯ ) with the following parameters: a = 6.2560(3) Å, b = 6.5680(3) Å, c = 13.1550(6) Å, α = 102.30(2)°, β = 90.07(2)°, γ = 116.98(2)°, Z = 2, V = 474.60(4) Å 3 and ρ cal = 2.86 g cm −3. The structure can be regarded as being built of isolated TeO 6 octahedra, SO 4 and SeO 4 tetrahedra and K + cations. The main feature of this structure is the coexistence of three different anions (TeO 6 6−, SO 4 2− and SeO 4 2− groups) in the unit cell, connected by O H⋯O hydrogen bonds. Crystals of K 2(SO 4) 0.9(SeO 4) 0.1·Te(OH) 6 undergo three endothermic peaks at 425 K, 465 K and 480 K. These transitions detected by DSC and analyzed by dielectric measurements using the impedance and modulus spectroscopy techniques. IR and Raman scattering measurements on K 2(SO 4) 0.9(SeO 4) 0.1·Te(OH) 6 material taken between 300 K and 620 K are reported in this paper. The spectra indicate clearly these phase transitions.
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