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

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1996.0134· OSTI ID:269892

Carter, J D; Appel, C C; Mogensen, M ^[1]

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1. Riso National Laboratory, Roskilde (Denmark)

Solid oxide fuel cell materials calcium doped lanthanum chromite (La,Ca)CrO{sub 3} 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 (LaCa)CrO{sub 3} and reacts with YXZ to obtain an intermediate layer of CaZrO{sub 3}. The width of the CaZrO{sub 3} 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 CaZrO{sub 3} matrix. The results demonstrate the improbability of cosintering (La,Ca)CrO{sub 3} and YSZ in the presence of the Ca-Cr-O liquid phase and illustrate the importance of obtaining single phase (La,Ca)CrO{sub 3} to achieve compatibility with YSZ.

• OSTI ID: 269892
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 122; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
40 CHEMISTRY
CALCIUM
CHEMICAL REACTIONS
CHROMIUM OXIDES
CRYSTAL DOPING
LANTHANUM COMPOUNDS
MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES