Abstract
A comparative TG and DTG study of the preparation and thermal stability of selected rare earth oxycarbonates, (REO) 2CO 3 (RE = La and Gd), shows that the ease of formation as well as the stability of these compounds decreases strongly with increasing atomic number of the host cation. According to X-ray powder diffraction analyses, the RE oxycarbonates obtained as decomposition products of acetate and carbonate hydrates belong to the tetragonal IA-type. UV- and dye laser-excited luminescence studies of Eu 3+-doped (LaO) 2CO 3 and (GdO) 2CO 3 reveal the presence of two different sites for the host cation. One of the sites resembles closely that prevailing in the tetragonal RE oxysalts, i.e. oxyhalides, oxysulphates, oxymolybdates and oxynitrates. A crystal field analysis carried out on the 7 F 1 and 7 F 2 level schemes according to a C 2v site symmetry confirms this hypothesis.
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