Sintering of Lanthanum Zirconate

Jalajakumari Nair, Padmakumar Nair, Giel B.M. Doesburg, Jan G. van Ommen, Julian R.H. Ross, Anthonie J. Burggraaf, Fujio Mizukami

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Abstract

Lanthanum zirconate (La2Zr2O7) was prepared by coprecipitating lanthanum nitrate and zirconyl oxychloride at pH 10, followed by ethanol washing. The initial high surface area of 304 m2·g−1 decreased very rapidly with increased sintering temperature and decreased to an immeasurably small value after heating at 1200°C for 15 h. The major parameters studied were phase evolution, crystallite size, porosity, surface area reduction, and shrinkage during sintering. Three temperature regions were identified based on these studies: below the crystallization temperature, between the crystallization temperature and 1100°C, and above 1100°C. The main contribution of surface area reduction in the region 800°–1100°C was due to surface diffusion; the main contribution above 1100°C was due to grain-boundary diffusion coupled with surface diffusion.
Original languageEnglish
Pages (from-to)2066-2072
JournalJournal of the American Ceramic Society
Volume82
Issue number8
DOIs
Publication statusPublished - Aug 1999

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    Nair, J., Nair, P., Doesburg, G. B. M., van Ommen, J. G., Ross, J. R. H., Burggraaf, A. J., & Mizukami, F. (1999). Sintering of Lanthanum Zirconate. Journal of the American Ceramic Society, 82(8), 2066-2072. https://doi.org/10.1111/j.1151-2916.1999.tb02042.x