X-ray diffraction, Raman study and electrical properties of the new mixed compound Rb1.7K0.3(SO4)0.88(SeO4)0.12Te(OH)6

At room temperature, the new compound Rb1.7K0.3(SO4)0.88(SeO4)0.12Te(OH)6 crystallizes in the monoclinic system with space group C2. The unit cell parameters are: a = 11.4168 (4), b = 6.6321 (4), c = 13.6078 (6), β = 106.975 (3), V = 985.46 (8), Z = 4 and ρcal = 3.25 g cm−1. The title compound undergoes a superionic phase transition at T = 479 K. This transition was confirmed by an abrupt increase of conductivity. Differential scanning calorimetry of Rb1.7K0.3(SO4)0.88(SeO4)0.12Te(OH)6 material showed three anomalies at 411, 461, and 479 K, respectively. and IR spectra of Rb1.7K0.3(SO4)0.88(SeO4)0.12Te(OH)6, recorded at room temperature in the frequency 50–4000 cm−1 show that the SO 4 2 - , SeO 4 2 - and TeO 6 6 - groups coexist in the crystal independently.