Synthesis of samarium oxysulfateSm2O2SO4 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

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Abstract

The oxidation process of samariumoxysulfide was studied in the temperature range of 500-1000 °C. Our DTA investigation allowed for establishing the main thermodynamic (∆Hº exp = -654.6 kJ/mol) and kinetic characteristics of the process (E a = 244 kJ/mol, A = 2 × 10 10). The enthalpy value of samarium oxysulfate (ΔHºf (Sm 2O 2SO 4(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)Å 3, 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 Sm 2O 2SO 4luminescence spectra exhibit three main bands easily assignable to the transitions from 4G 5/2 state to 6H 5/2, 6H 7/2, and 6H 9/2 multiplets.

Original languageEnglish
Article number1330
Number of pages15
JournalMolecules
Volume25
Issue number6
DOIs
Publication statusPublished - 14 Mar 2020

Keywords

  • Luminescence
  • Oxysulfate
  • Samarium
  • Structure
  • Thermochemistry
  • samarium
  • LN
  • PR
  • SPECTROSCOPIC PROPERTIES
  • RARE-EARTH SULFATES
  • DECOMPOSITION
  • oxysulfate
  • structure
  • thermochemistry
  • OXYGEN-STORAGE
  • LN(2)O(2)SO(4)
  • luminescence
  • LA
  • KINETICS
  • ND

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    Denisenko, Y. G., Sal'nikova, E. I., Basova, S. A., Molokeev, M. S., Krylov, A. S., Aleksandrovsky, A. S., Oreshonkov, A. S., Atuchin, V. V., Volkova, S. S., Khritokhin, N. A., & Andreev, O. V. (2020). Synthesis of samarium oxysulfateSm2O2SO4 in the high-temperature oxidation reaction and its structural, thermal and luminescent properties. Molecules, 25(6), [1330]. https://doi.org/10.3390/molecules25061330