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Synthesis and characterization of the new mixed valent compound Mn _5VO _8

机译:新型混合价化合物Mn _5VO _8的合成与表征

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This work describes the synthesis and characterization of the new compound Mn _5VO _8. This phase is the only known ternary mixed valent compound in the system MnO-Mn _2O _3-V _2O _5 and crystallizes in a so far unknown crystal structure, which leads to coordination for the Jahn-Teller cation Mn ~(3+) in distorted octahedra (elongated and compressed, respectively). The material can be prepared by solid state reaction at 900 °C in a monoclinic [a = 19.5605(10) ?, b = 6.2184(3) ?, c = 5.4276(3) ?, β = 100.078(4)°, C2/m, Z = 4] as well as in a triclinic [a = 5.4320(2) ?, b = 6.2066(2) ?, c = 10.2443(4) ?, α = 107.035(3)°, β = 99.469(3)°, = 90.422(4)°, P$ar{1}$, Z = 2] modification, depending on the composition of the starting material mixture (7MnO + V _2O _5 versus 0.5Mn _2O _3 + 4MnO + 0.5V _2O _5). Quantum mechanical calculations were carried out in order to get more detailed information on the material. Thereby, ionic charges could be assigned to the manganese atoms at the different crystallographic sites.
机译:这项工作描述了新化合物Mn _5VO _8的合成和表征。该相是系统MnO-Mn _2O _3-V _2O _5中唯一已知的三元混合价化合物,并以迄今未知的晶体结构结晶,这导致Jahn-Teller阳离子Mn〜(3+)发生了配位畸变。八面体(分别是伸长的和压缩的)。该材料可以通过在单斜[900 = 19.5605(10),b = 6.2184(3),c = 5.4276(3),β= 100.078(4)°,C2时在900°C下进行固态反应制备。 / m,Z = 4]以及三斜线[a = 5.4320(2)?,b = 6.2066(2)?,c = 10.2443(4)?,α= 107.035(3)°,β= 99.469( 3)°= 90.422(4)°,P $ bar {1} $,Z = 2]修饰,具体取决于原料混合物的组成(7MnO + V _2O _5对0.5Mn _2O _3 + 4MnO + 0.5 V _2O _5)。为了获得有关材料的更多详细信息,进行了量子力学计算。因此,可以将离子电荷分配给不同晶体学位置处的锰原子。

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