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

Research output: Contribution to journalArticlepeer-review

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 approx. 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 approx. 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
Number of pages7
JournalJournal of the American Ceramic Society
Volume82
Issue number8
DOIs
Publication statusPublished - 1999

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