Reactions at the calcium doped lanthanum chromite-yttria stabilized zirconia interface
- 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, Vol. 122, Issue 2; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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