Reactions at the calcium doped lanthanum chromite-yttria stabilized zirconia interface

被引：27

作者：

Carter, JD ^{[1
]}

Appel, CC ^{[1
]}

Mogensen, M ^{[1
]}

机构：

[1] RISO NATL LAB,DEPT MAT,DK-4000 ROSKILDE,DENMARK

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1996年 / 122卷 / 02期

关键词：

The authors thank H. Nilsson for sample preparation and photographic work. This work was performed under the EEC JOULE program; as part of the project JOUE-CT91-0086 and JOU2-CT92-0202 led by Asea Brown Boveri AG;

D O I：

10.1006/jssc.1996.0134

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Solid oxide fuel cell materials calcium doped lanthanum chromite (La,Ca)CrO3 and yttria stabilized zirconia (YSZ) are known to interact with each other, This interaction causes interruption of cosintering processes and the formation of secondary phases which degrade fuel cell performance. The present study shows by X-ray diffraction and microscopic analysis that Ca migrates via an exsolved Ca-Cr-O liquid phase emanating from (La,Ca)CrO3 and reacts with YSZ to obtain an intermediate layer of CaZrO3, The width of the CaZrO3 reaction region was found to increase with increasing Ca content in the exsolved Ca-Cr-O second phase. Calcium zirconate was observed to react with YSZ along the YSZ grain boundaries, eventually digesting YSZ grains into a CaZrO3 matrix. The results demonstrate the improbability of cosintering (La,Ca)CrO3 and YSZ in the presence of the Ca-Cr-O liquid phase and illustrate the importance of obtaining single phase (La,Ca)CrO3 to achieve compatibility with YSZ. (C) 1996 Academic Press, Inc.

引用

页码：407 / 415

页数：9

共 13 条

[1]

Armstrong T. R., 1993, Proceedings of the Third International Symposium on Solid Oxide Fuel Cells, P632

[2]

BAGGER C, 1992, 1992 FUEL CELL SEM T, P241

[3]

Carter J. D., 1993, Proceedings of the Third International Symposium on Solid Oxide Fuel Cells, P344

[4] Liquid phase behaviour in nonstoichiometric calcium-doped lanthanum chromites [J].