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Sintering of Lanthanum Zirconate
Author(s) -
Nair Jalajakumari,
Nair Padmakumar,
Doesburg Giel B. M.,
Ommen Jan G.,
Ross Julian R. H.,
Burggraaf Anthonie J.,
Mizukami Fujio
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02042.x
Subject(s) - sintering , lanthanum , materials science , crystallization , porosity , crystallite , diffusion , shrinkage , zirconate , grain boundary , mineralogy , lanthanum oxide , surface diffusion , metallurgy , chemical engineering , analytical chemistry (journal) , composite material , oxide , inorganic chemistry , microstructure , ceramic , chemistry , chromatography , thermodynamics , physics , engineering , titanate , organic chemistry , adsorption
Lanthanum zirconate (La 2 Zr 2 O 7 ) was prepared by coprecipitating lanthanum nitrate and zirconyl oxychloride at pH 10, followed by ethanol washing. The initial high surface area of ∼304 m 2 ·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.