Electrical properties of La1.33-xLi3xTi2O6 (0.1<x<0.3)

被引：66
|
作者：
Ruiz, AI [1 ]
Lopez, ML [1 ]
Veiga, ML [1 ]
Pico, C [1 ]
机构：
[1] Univ Complutense, Fac Ciencias Quim, Dept Quim Inorgan 1, E-28040 Madrid, Spain
来源：
SOLID STATE IONICS | 1998年 / 112卷 / 3-4期
关键词：
perovskite; ionic conductors;
D O I：
10.1016/S0167-2738(98)00220-3
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Structural characterization and ionic conductivity properties of three members of the La1.33-xLi3xTi2O6 (being x = 0.29, 0.21 and 0.09, respectively) perovskite-type series are reported. These phases are described as tetragonal (S.G. P4/mmm) and the unit cell parameters (a approximate to 3.87 and c approximate to 7.78 Angstrom) are related to the cubic ABO(3) perovskite one. X-ray diffraction data were analyzed by the Rietveld method and an interesting feature is that the cation vacancies are concentrated on alternating A-planes (i.e. for z = 1/2) of the structure. Therefore, cation mobility seems to be due to a 2-D mechanism in such planes. Electrical properties have been measured by a.c. techniques and the higher conductivity results were obtained for the intermediate composition, x approximate to 0.21. The activation energies of the three phases are quite similar. (C) 1998 Elsevier Science B.V. All rights reserved.
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页码：291 / 297
页数：7
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