IONIC TRANSPORT IN LINBO3

被引：45

作者：

MEHTA, A

CHANG, EK

SMYTH, DM

机构：

[1] Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015

[2] BOC Group, Inc., Murray Hill, New Jersey 07974

来源：

JOURNAL OF MATERIALS RESEARCH | 1991年 / 6卷 / 04期

关键词：

D O I：

10.1557/JMR.1991.0851

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high temperature equilibrium conductivity (950-degrees-C-1050-degrees-C) of congruent LiNbO3 can be resolved into two components: an electronic portion that is dependent on the oxygen partial pressure and an ionic portion that is pressure independent. It is shown that the two components can be obtained from an analysis of the total equilibrium conductivity measured as a function of oxygen partial pressure. The ionic transport number (fractional ionic conductivity) thus obtained is compared with that obtained from an oxygen concentration cell measurement. The two techniques are found to be in excellent agreement, confirming the experimental validity of the defect chemistry method. From the temperature dependence of the ionic conductivity, the activation energy (138 kJ/mol [1.43 eV]) for the ionic transport is obtained. The results are in good agreement with the value previously obtained for the oxygen chemical diffusivity.

引用

页码：851 / 854

页数：4