Dependence of structure and ionic conductivity on the composition of Na+/Pr3+-beta''-alumina

被引：21

作者：

Kohler, J ^{[1
]}

Urland, W ^{[1
]}

机构：

[1] UNIV HANNOVER,SONDERFORSCH BEREICH 173,D-30167 HANNOVER,GERMANY

来源：

SOLID STATE IONICS | 1996年 / 86-8卷

关键词：

impedance spectroscopy; beta''-alumina; ion exchange; ionic conductivity; lanthanide ions; activation energy;

D O I：

10.1016/0167-2738(96)00098-7

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：

The structure of completely exchanged Na+/Pr3+-beta ''-alumina crystals have been investigated by single crystal X-ray diffraction methods at room temperature. Ionic distributions within the conduction planes are correlated with the crystal composition. Up to 52% of the lanthanide ions are found to occupy BR positions. The conduction behaviour of Na+/Pr3+-beta ''-Al2O3 crystals with varying degree of exchange were determined by impedance spectroscopy in a temperature range of 300-1000 K. With growing Pr3+ content the ionic conductivity (sigma) is lowered connected with an increasing activation energy E(a). For a given degree of exchange sigma scatters of about 1-2 orders of magnitude and E(a) within 0.15-0.2 eV. These deviations can be understood by the different crystal compositions influencing the thickness of the conduction slabs and the ionic distributions.

引用

页码：93 / 98

页数：6

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