Effect of Co addition on the lattice parameter, electrical conductivity and sintering of gadolinia-doped ceria

被引：88

作者：

Lewis, GS

Atkinson, A

Steele, BCH

Drennan, J

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[2] Univ Queensland, Ctr Microscopy & Microanal, St Lucia, Qld 4067, Australia

来源：

SOLID STATE IONICS | 2002年 / 152卷

关键词：

oxygen-ion conductivity; electrolytes; lattice parameter; liquid-phase sintering; doped ceria;

D O I：

10.1016/S0167-2738(02)00372-7

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：

Co-sintering aid has been added to Ce1.9Gd0.1O1.95 (CGO) by treating a commercial powder with Co(NO3)(2) (COCGO), X-ray diffraction (XRD) measurements of lattice parameter indicated that the Co was located on the CGO particle surface after calcination at 650 degreesC. After heat treatment at temperatures above 650 degreesC, the room temperature lattice parameter of CGO was found to increase, indicating redistribution of the Gd. Compared to CGO, the lattice parameter of CGO + 2 cation% Co (2CoCGO) was lower for a given temperature (650-1100 degreesC), A.C. impedance revealed that the lattice conductivity of 2CoCGO was enhanced when densified at lower temperatures, Transmission electron microscopy (TEM) showed that, even after sintering for 4 h at 980 degreesC, most of the Co was located at grain boundaries. (C) 2002 Published by Elsevier Science B.V.

引用

页码：567 / 573

页数：7

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