X-ray single crystal, thermal analysis and vibrational study of (NH 4 ) 2 (SO 4 ) 0.92 H(AsO 4 ) 0.08 ⋅Te(OH) 6

New mixed compound Cs2.8Tl1.2(SO4)1.48(SeO4)0.52.[Te(OH)6]2: Synthesis, structural characterization, vibrational studies and phase transitions

“…[Te(OH)6]2 compound exhibits a symmetry space group P21/n with four formula units. It is noteworthy to note that the obtained results pertaining to the TeO6, SO4, SeO4 bands (in Table 3) are in accordance with those obtained in the literature corresponding to the new compound [1,5,16,[24][25][26][27][28][29].…”

“…This vibration is detected in the IR spectra at 965 cm -1 . The two vibration modes ν4(TeO6) and ν5(TeO6) are noted as two bands at 356 and 362 cm -1 , respectively, however, they are not observed in IR spectrum [15,25,29].…”

“…In addition, all the vibration modes in the SO4 tetrahedral group are Raman active, while only ν2 and ν3 are IR active. The very weak band detected at 471 cm -1 is assigned to ν2 (SO4) [25,25], while the band associated with the asymmetric stretching vibration ν3 of (SO4) appears in the spectra at 1077 cm -1 [15,[25][26][27][28][29].…”

“…In the high-frequency region (1300-2600) cm -1 , the broad bands at 1481, 2327 and 2365 cm -1 in IR can be assigned to the asymmetric as well as the symmetric stretching vibrations of the O−H…O groups of the hydrogen bond, respectively, with respect to this material [25,29].…”

Thermal behavior and physicochemical studies of phase transitions before the decomposition in the selenate–tellurate protonic conductor material

“…), the vibrational study at room temperature was performed, the infrared and Raman spectra of this compound at room temperature, investigated in the frequency range of 400 -4000 cm -1 and 50 -1200 cm -1 respectively, are shown in Figure 8 and 9. The proposed assignments of the most important bands Table 3 were carried out using data for similar selenate and tellurate compounds [3,[16][17][18].…”