Abstract
The thermal decomposition in air at temperatures up to 1450°C of hydrated europium sulfate has been studied by high-resolution luminescence spectroscopy. X-ray powder diffraction, differential thermal analysis (DTA), and thermogravimetric analysis (TGA). Information regarding the number of europium(III) species present in a particular material can be deduced from the fine structure within the europium(III) emission bands. Determination of the site symmetry of the europium(III) emitting species can be deduced from a complete analysis of the luminescence spectra. The application of this method has shown the presence of a multitude of partially dehydrated species in materials where the more conventional thermal analysis methods predict the presence of only pure anhydrous material. The data indicate the presence of an intermediate assumed to be Eu 2O(SO 4) 2. The presence of this intermediate has been suggested before, though never actually observed. Complete decomposition to Eu 2O 2SO 4 occurs by 800°C and finally to Eu 2O 3 by 1150°C.
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