Exploration of structural, thermal and spectroscopic properties of self-activated sulfate Eu-2(SO4)(3) with isolated SO4 groups

Denisenko, Yu. G.; Aleksandrovsky, A. S.; Atuchin, V. V.; Krylov, A. S.; Molokeev, M. S.; Oreshonkov, A. S.; Shestakov, N. P.; Andreev, O. V. Source: JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 68 109-116; 10.1016/j.jiec.2018.07.034 DEC 25 2018

Eu2(SO4)3 was synthesized by chemical precipitation method and the crystal structure was determined by Rietveld analysis. The compound crystallizes in monoclinic space group С2/с. In the air environment, Eu2(SO4)3 is stable up to 670 °C. The sample of Eu2(SO4)3 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. The low site symmetry of SO4 tetrahedra results in the appearance of the IR inactive ν1 mode around 1000 cm−1 and ν2 modes below 500 cm−1. The band intensities redistribution in the luminescent spectra of Eu3+ ions is analyzed in terms of the peculiarities of its local environment.