Crystal structure of loparite

被引：0

作者：

N. V. Zubkova

A. V. Arakcheeva

D. Yu. Pushcharovskii

E. I. Semenov

D. Atencio

机构：

[1] Moscow State University,Baikov Institute of Metallurgy and Materials Technology

[2] Russian Academy of Sciences,Mineralogical Museum

[3] Russian Academy of Sciences,Institute of Geoscience

[4] University of São Paulo,undefined

[5] Caixa Postal,undefined

来源：

Crystallography Reports | 2000年 / 45卷

关键词：

Radiation; Reflection; Crystal Structure; Perovskite; Diffraction Analysis;

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摘要：

The crystal structure of the cubic modification of the natural mineral loparite has been studied for the first time by the methods of the X-ray diffraction analysis (γMoKα radiation, 105 independent reflections with I > 3σ(I), R = 0.041 in the anisotropic approximation). The structure belongs to the perovskite type (ABO3) with the double period of the cubic unit cell, a = 7.767(1) Å (sp. gr. Pn3m; Z = 2 for the composition (Ca,Na,Ce)(Na,Ce)3(Ti,Nb)2Ti2O12. Period doubling is explained by ordering of cations both in the A and the B positions.

引用

页码：210 / 214

页数：4