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 (∆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.
Highlights
The compounds of rare-earth elements (REEs) with tetrahedral anions, possessing a set of rather valuable properties, have attracted the attention of researchers for recent years
× 10 ).The enthalpy ated process enthalpy value coincides the value. It e of samarium oxysulfate
Enthalpy the temperature range of of samarium oxysulfate formation was calculated by the Hess law and the value is equal to
Summary
The compounds of rare-earth elements (REEs) with tetrahedral anions, possessing a set of rather valuable properties, have attracted the attention of researchers for recent years. Rare earth oxysulfates are used as precursors for the production of REE2 O2 S compounds [1,2,3]. The structural and chemical properties of REE2 O2 SO4 oxysulfates make it possible to consider them as promising. Oxysulfates are formed upon the decomposition of REE compounds. Oxysulfates can be obtained by the decomposition of organic sulfonates of various structures [18]. 625003, the compounds with the stoichiometric lanthanide ion content attract ent of General Chemistry, Northen. SB RAS, materials cannot Institute be restricted only by their Research luminescent properties. University, Khabarovsk 680021, Russia structural, thermal and spectroscopic properties.
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