Structure of Mg<sub>2.56</sub>V<sub>1.12</sub>W<sub>0.88</sub>O<sub>8</sub> and Vibrational Raman Spectra of Mg<sub>2.5</sub>VWO<sub>8</sub> and Mg<sub>2.5</sub>VMoO<sub>8</sub>
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Mg2.56V1.12W0.88O8 crystals were grown from a MgO/V2O5/WO3 melt. X-ray single-crystal diffraction studies revealed that it is orthorhombic with space group Pnma, a = 5.0658(5) Å, b = 10.333(1) Å, c = 17.421(2) Å, Z = 6, and is isostructural with Mg2.5VMoO8. Raman spectra are reported, and the assignment of the Raman bands is made by comparing the metal−oxygen vibrations of VO4/WO4 tetrahedra in Mg2.5VWO8 with the metal−oxygen vibrations of VO4/MoO4 tetrahedra in Mg2.5VMoO8. The stretching vibrations appearing at 1016 and 1035 cm-1 are assigned to MoO and WO double bonds, respectively, associated with the Mg2+ cation vacancies.
创建时间：
2016-05-05
