Abstract
The chemical stability of diffusion couples and coarse grain powder mixtures of calcium substituted lanthanum manganite and cubic calcia stabilized zirconia have been studied. The aim was to investigate the chemical stability of these materials as a model system for respectively the cathode and the electrolyte in solid oxide fuel cells. With increasing amount of Ca in lanthanum manganite, the major secondary phase was shifted from La2Zr2O7 to CaZrO3, and the thickness of the reaction layers of secondary phases was increasing with increasing heat treatment time. Precipitation of La2O3 had taken place in the perovskite containing low amounts of Ca (0 and 20 mol %). The transport mechanisms of the cations were strongly dependent on the interface geometry. La0.7Ca0.3MnO3 was observed to give the most stable interface to zirconia both in air and in reducing atmosphere (pO ∼ 10−6 atm). A-site deficiency of LaMnO3 was also observed to increase the stability. However, we conclude that a thin film of an electrode material consisting of lanthanum manganite on a zirconia substrate is unstable, regardless of A-site deficiency, because the solubility limit of Mn in the zirconia is not reached. From the experimental data, a reaction mechanism has been proposed, based on observations of relative diffusion rates.
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References
K. Wiik, C. R. Schmidt, S. Faaland, S. Shamsili, M.-A. Einarsrud and T. Grande, J. Amer. Ceram. Soc. 82(3) (1999) 721.
K. Kleveland, M.-A. Einarsrud, C. R. Schmidt, S. Shamsili, S. Faaland, K. Wiik and T. Grande, ibid. 82(3) (1999) 729.
H. Kaneko, H. Taimatsu, K. Wada and E. Iwamoto, Proceedings of the Second International Symposium on Solid Oxide Fuel Cells, Athens, 1991, edited by F. Gross, P. Zegers, S. C. Singhal and O. Yamamoto, p. 673.
J. Mizusaki, H. Tagawa, K. Tsuneyoshi and A. Sawata, J. Electrochem. Soc. 138(7) (1991) 1867.
J. Mizusaki, H. Tagawa, K. Tsuneyoshi, A. Sawara, M. Katou and K. Hirano, Denki Kagaku 586) (1990) 520.
H. Tagawa, J. Mizusaki, M. Katou, K. Hirano, A. Sawata and K. Tsuneyoshi, Proceedings of the Second International Symposium on Solid Oxide Fuel Cells, Athens, 1991, edited by F. Gross, P. Zegers, S. C. Singhal and O. Yamamoto, p. 681.
Y. Takeda, Y. Sakai, T. Ichikawa, N. Imanishi and O. Amamoto, Solid State Ionics 72(1994) 257.
K. Tsuneyoshi, K. Mori, A. Sawata, J. Mizusaki and H. Tagawa, ibid. 35(1989) 263.
H. Taimatsu, K. Wada, H. Kaneko and H. Yamamura, J. Amer. Ceram. Soc. 75(2) (1992) 401.
S. Faaland, M.-A. Einarsrud, K. Wiik and T. Grande, J. Mater. Sci. 34(1999) 957.
H. Schmalzried, in “Chemical Kinetics of Solids” (VCH, Weinheim, 1995) p. 153.
A. Mitterdorfer, M. Cantoniand L. J. Gauckler, Proceedings of the Second European Solid Oxide Fuel Cell Forum, Oslo, May 1996, edited by B. Thorstensen, p. 373.
A. Rouanet, Rev. Int. Hautes Temp. Refract. 8(1971) 161.
T. Noguchi and O. Yonemochi, J. Amer. Ceram. Soc. 52(1969) 178.
R. L. Shultz and A. Muan, ibid. 54(1971) 504.
L. M. Lopato, L. I. Lugin, G. I. Gerasimyuk and A. V. Shevchenko, Ukr. Khim. Zh. 38(2) (1972) 143.
R. D. Shannon and C. T. Prewitt, Acta Cryst. B25(1968) 925.
Willer and Daire, Bull. Soc.Fr. Mineral. Cristallogr. 92(1969) 33.
C. Clausen, C. Bagger, J. B. Bilde-sørensen and A. Horsewell, Solid State Ionics 70/71(1994) 59.
Y. Yin and B. B. Argent, J. Phase Equilibria 14(4) (1993) 439.
J. R. Hellmann and V. S. Stubican, J. Amer. Ceram. Soc. 66(1983) 260.
V. S. Stubican, G. S. Corman, . R. Hellmann and G. Senft, in 'Advances in Ceramics' 12 Science and Technology of Zirconia II, edited by N. Claussen, M. Ruhle and A. H. Heuer (Am. Ceram. Soc., 1984) p. 96.
S. K. Lau and S. C. Singhal, in 'Corrosion 85: The International Corrosion Forum Devoted to the Protection and Performance of Materials, Boston, March 1985' (NACE, Houston, 1985) p. 79.
J. D. Carter, C. C. Appel and M. Mogensen, J. Solid State Chem. 122(1996) 407.
H. S. Carslaw and J. C. Jaeger, in “Conduction of Heat in Solid,” 2nd ed. (Oxford University Press, Oxford, 1959) p. 60.
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Faaland, S., Einarsrud, MA., Wiik, K. et al. Reactions between La1−x CaxMnO3 and CaO-stabilized ZrO2 Part II Diffusion couples. Journal of Materials Science 34, 5811–5819 (1999). https://doi.org/10.1023/A:1004766419921
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DOI: https://doi.org/10.1023/A:1004766419921