Abstract
A critical comparison of X-ray powder diffraction data, combined with experimental work, shows that "monoclinic B-type" La2O3 and Pr2O3 described in the literature are in fact rare earth silicates of the hexagonal apatite-type structure. A comparison of X-ray powder data reveals that both compounds are identical with La9.33(SiO4)6O2 and Pr9.33(SiO4)6O2, respectively. This confirms the currently acknowledged stability diagram of the rare earth sesquioxides.
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