Abstract
Abstract The phase diagram of the Lu 2 O 3 LuF 3 binary system was investigated by quantitative differential thermal analysis in the (1000–1750) K temperature range, as well as by X-ray powder diffraction analysis. At temperatures lower than 1075 K, only the well-known compounds Lu 2 O 3 , LuOF, LuF 3 and the series of fluorite-related orthorhombic vernier phases of the general composition Lu n O n −1 F n +2 with n = 5–10 were found to exist. At (1076 ± 4) K an anion-deficient, fluorite-related and presumably monoclinic phase of the composition Lu(O, F) 1.91±0.01 is formed by eutectoid reaction of Lu 2 O 3 and LuOF. LuOF decomposes at (1079 ± 4) K in a peritectoid reaction into Lu(O, F) 1.91±0.01 and the vernier phase Lu 10 O 9 F 12 . All vernier phases were characterized with respect to their lattice parameters, and it was found that the lattice parameters depend linearly on composition.
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