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Abstract A high-precision X-ray diffraction study of single crystals of two compositions—La2Mo1.78V0.22O8.89 and La2Mo1.64V0.36O8.82—was performed. In the vanadium-doped compounds, as in the structure of the metastable βms phase of pure La2Mo2O9, the La and Mo atoms and one of the three oxygen atoms are displaced from the threefold axis, on which they are located in the high-temperature β phase. The structure contains two partially occupied oxygen sites. It was shown that molybdenum atoms are partially replaced by vanadium atoms, which are not involved in the disordering, are located on the threefold axis, and are shifted toward one of the oxygen atoms. This is consistent with the temperature-induced changes in the structure of La2Mo2O9 and the changes in the properties of these crystals caused by the introduction of vanadium atoms into the structure.
Crystallography Reports – Springer Journals
Published: Nov 1, 2013
Keywords: Crystallography and Scattering Methods
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