Synthesis and crystal structure of new layered perovskite compounds:: Li2La0.833(Nb1.5Ti0.5)O7 and Li2La2.25(Nb1.25Ti2.75)O13

被引：8

作者：

Crosnier-Lopez, MP ^{[1
]}

Duroy, H ^{[1
]}

Fourquet, JL ^{[1
]}

机构：

[1] Univ Maine, Fac Sci, Lab Fluorures, CNRS,UPRESA 6010, F-72085 Le Mans 9, France

来源：

MATERIALS RESEARCH BULLETIN | 1999年 / 34卷 / 02期

关键词：

oxides; chemical synthesis; X-ray diffraction; crystal structure;

D O I：

10.1016/S0025-5408(99)00016-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single crystals of Li2La0.833(Nb1.5Ti0.5)O-7 and Li2La2.25(Nb1.25Ti2.75)O-13 were grown in the system Li2O-La2O3-NPb2O5-TiO2. Both these compounds crystallize in the space group P4(2)/mnm (No. 136), Z = 4: a = 5.5334(2), c = 18.3907(2) Angstrom and a = 5.4915(6), and c = 33.812(4) Angstrom, respectively. Their crystal structures, determined from single crystal X-ray diffraction data, are related to the Ruddlesden-Popper phases A(n+1)B(n)O(3n+1), which could be better written here as Li-2[A(x)B(n)O(3n+1)]: Li2La0.833(Nb1.5Ti0.5)O-7 is an n = 2 member and Li2La2.25(Nb1.25Ti2.75)O-13 corresponds to an n = 4 member. In both structures, Nb5+ and Ti4+ ions statistically occupy distorted B octahedral sites of the perovskite, La3+ ions partially fill the cages of the perovskite, and Li+ ions are found in tetrahedral coordination between the perovskite layers. (C) 1999 Elsevier Science Ltd.

引用

页码：179 / 191

页数：13

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