Sintering of Lanthanum Zirconate |
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Authors: | 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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Affiliation: | Faculty of Chemical Technology, University of Twente, Enschede, The Netherlands;National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305–8565, Japan |
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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. |
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