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The FT-IR absorption, FT-Raman scattering, X-ray powder diffraction (XPD), and thermogravimetry were used to explore the non-stoichiometry in LaOF. The TGA-DTA analyses between 30 and 1500°C showed that the LaO 1-x F 1+2x phases yielded the stoichiometric LaOF as an intermediate product. The temperature of formation of the LaOF and La 2 O 3 ...
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