Synthesis of Samarium OxysulfateSm<sub>2</sub>O<sub>2</sub>SO<sub>4</sub> in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties
Yu. G. Denisenko,
E. I. Sal’nikova,
S. A. Basova,
M. S. Molokeev,
A. S. Krylov,
A. S. Aleksandrovsky,
A. S. Oreshonkov,
V. V. Atuchin,
S. S. Volkova,
N. A. Khritokhin,
O. V. Andreev
Affiliations
Yu. G. Denisenko
Department of General and Special Chemistry, Industrial University of Tyumen, 625000 Tyumen, Russia
E. I. Sal’nikova
Institute of Chemistry, Tyumen State University, 625003 Tyumen, Russia
S. A. Basova
Institute of Chemistry, Tyumen State University, 625003 Tyumen, Russia
M. S. Molokeev
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
A. S. Krylov
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
A. S. Aleksandrovsky
Laboratory of Coherent Optics, Kirensky Institute of Physics Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
A. S. Oreshonkov
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
V. V. Atuchin
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia
S. S. Volkova
Research Resource Center “Natural Resource Management and Physico-Chemical Research”, Tyumen State University, 625003 Tyumen, Russia
N. A. Khritokhin
Institute of Chemistry, Tyumen State University, 625003 Tyumen, Russia
O. V. Andreev
Institute of Chemistry, Tyumen State University, 625003 Tyumen, Russia
The oxidation process of samariumoxysulfide was studied in the temperature range of 500−1000 °C. Our DTA investigation allowed for establishing the main thermodynamic (∆Hºexp = −654.6 kJ/mol) and kinetic characteristics of the process (Ea = 244 kJ/mol, A = 2 × 1010). The enthalpy value of samarium oxysulfate (ΔHºf (Sm2O2SO4(monocl)) = −2294.0 kJ/mol) formation was calculated. The calculated process enthalpy value coincides with the value determined in the experiment. It was established that samarium oxysulfate crystallizes in the monoclinic symmetry class and its crystal structure belongs to space group C2/c with unit cell parameters a = 13.7442 (2), b = 4.20178 (4) and c = 8.16711 (8)Å, β = 107.224 (1)°, V = 450.498 (9)Å3, Z = 4. The main elements of the crystalline structure are obtained and the cation coordination environment is analyzed in detail. Vibrational spectroscopy methods confirmed the structural model adequacy. The Sm2O2SO4luminescence spectra exhibit three main bands easily assignable to the transitions from 4G5/2 state to 6H5/2, 6H7/2, and 6H9/2 multiplets.
