OXIDE-ION CONDUCTIVITY IN SOME SUBSTITUTED RARE-EARTH PYROZIRCONATES

被引：57

作者：

KUTTY, KVG ^{[1
]}

MATHEWS, CK ^{[1
]}

RAO, TN ^{[1
]}

VARADARAJU, UV ^{[1
]}

机构：

[1] INDIAN INST TECHNOL,MAT SCI RES CTR,MADRAS 600036,TAMIL NADU,INDIA

来源：

SOLID STATE IONICS | 1995年 / 80卷 / 1-2期

关键词：

IONIC CONDUCTIVITY; OXYGEN; IMPEDANCE SPECTROSCOPY; PYROZIRCONATES; SUBSTITUTION;

D O I：

10.1016/0167-2738(95)00127-R

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：

This paper reports oxide ion conductivity measurements on pyrozirconates of neodymium and gadolinium in which the rare earth elements were partially substituted by strontium, and zirconium partially substituted by aluminium. 5-10 atom% Sr and very little Al were found to enter the pyrochlore lattice. ac impedance measurements have shown an enhancement of conductivity as a result of the incorporation of small amounts of Sr in both the pyrochlores. In the Gd2Zr2O7 system, this could be traced to an improvement of the grain interior conductivity, by resolving the grain interior and grain boundary contributions to the total conductivity. Such a separation of the bulk and grain boundary conductivities could not be achieved in the Nd2Zr2O7-based compositions. The observed variations in conductivity are explained in terms of the pyrochlore crystal chemistry.

引用

页码：99 / 110

页数：12

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