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Extension of the La7MO7O30 structural type with La7Nb3W4O30 and La7Ta3W4O30 compounds

机译:使用La7Nb3W4O30和La7Ta3W4O30化合物扩展La7MO7O30结构类型

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Two compounds of formula La(7)A(3)W(4)O(30) (with A = Nb and Ta) were prepared by solid-state reaction at 1450 and 1490 degrees C. They crystallize in the rhombohedric space group R-3 (No. 148), with the hexagonal parameters: a = 17.0640(2) angstrom, = 6.8859(1)angstrom and a = 17.0701(2)angstrom(,) c = 6.8851(1) =angstrom The structure of the materials was analyzed from X-ray, neutron and electronic diffraction. These oxides are isostructural of the reduced molybdenum compound La7MO7O30, which are formed of perovskite rod along [111]. An order between (Nb, Ta) and W is observed. (c) 2005 Elsevier Inc. All rights reserved.
机译:通过在1450和1490摄氏度下的固相反应制备了两种式La(7)A(3)W(4)O(30)的化合物(A = Nb和Ta)。它们在菱形空间群R中结晶-3(No. 148),具有六边形参数:a = 17.0640(2)埃,= 6.8859(1)埃,a = 17.0701(2)埃,, c = 6.8851(1)=埃通过X射线,中子和电子衍射对材料进行了分析。这些氧化物是还原的钼化合物La7MO7O30的同构结构,该化合物由钙钛矿棒沿[111]形成。观察到(Nb,Ta)和W之间的顺序。 (c)2005 Elsevier Inc.保留所有权利。

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