High-temperature oxidation of europium (II) sulfide
- Denisenko, Y. G.
- Molokeev, M. S.
- Krylov, A. S.
- Aleksandrovsky, A. S.
- Oreshonkov, A. S.
- Atuchin, V. V.
- Azarapin, N. O.
- Plyusnin, P. E.
- Sal'Nikova, E. I.
- Andreev, O. V.
DOIAbstract
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of 500–1000 °C. The oxidation reaction enthalpy was determined (ΔH0 exp = −1718.5 kJ/mol). The study of oxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 °C, EuS is oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 °C, only europium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by the Rietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4f transitions from the 5D0 state was investigated as a function of oxidation temperature
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