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| Home > Publications database > A-Site-Ordered Perovskite $\mathrm{MnCu_3V_4O_{12}}$ with a 12-Coordinated Manganese(II) |
| Home > Publications database > A-Site-Ordered Perovskite $\mathrm{MnCu_3V_4O_{12}}$ with a 12-Coordinated Manganese(II) |
| Journal Article | PUBDB-2016-00645 |
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2013
American Chemical Society
Washington, DC
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Please use a persistent id in citations: doi:10.1021/ic401855j
Abstract: A novel cubic perovskite MnCu$_3$V$_4$O$_{12}$ has been synthesized at a high pressure and high temperature of 12 GPa and 1373 K. This compound crystallizes in the A-site-ordered perovskite structure (space group Im3̅) with lattice constant a = 7.26684(10) Å at room temperature. The most notable feature of this compound lies in the fact that the Mn2+ ion is surrounded by 12 equidistant oxide ions to form a regular icosahedron; the situation of Mn2+ is unprecedented for the crystal chemistry of an oxide. An anomalously large atomic displacement parameter Uiso= 0.0222(8) Å$^2$ is found for Mn$^{2+}$ at room temperature, indicating that the thermal oscillation of the small Mn$^{2+}$ ion in a large icosahedron is fairly active. Magnetic susceptibility and electric resistivity measurements reveal that 3d electrons of Mn$^{2+}$ ions are mainly localized, while 3d electrons in Cu$^{2+}$ and V$^{4+}$ ions are delocalized and contribute to the metallic conduction.
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