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Crystal Structure of Zirconia Prepared with Alumina by Coprecipitation
Author(s) -
Kikkawa Shinichi,
Kijima Akio,
Hirota Ken,
Yamamoto Osamu
Publication year - 2002
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.1151-2916.2002.tb00161.x
Subject(s) - tetragonal crystal system , coprecipitation , crystallite , solid solution , materials science , crystallinity , cubic zirconia , crystal structure , aqueous solution , crystallography , powder diffraction , phase (matter) , mineralogy , inorganic chemistry , chemistry , metallurgy , ceramic , composite material , organic chemistry
Zirconia was prepared by firing the coprecipitate from ZrOCl 2 and AlCl 3 mixed aqueous solution with ammonia. When fired above 600°C, the products were fine crystalline tetragonal zirconia of crystallite size <10 nm. In previous studies, the tetragonal phase had been assumed to be a (Zr 1− x 4+ Al x 3+ )O 2− x /2 solid solution, where x ≤ 0.25. However, X‐ray diffraction pattern simulation and Al K ‐edge XANES spectroscopy confirmed the present product to be a mixture of t ‐ZrO 2 fine powder with a small amount of δ‐Al 2 O 3 of very low crystallinity, even below the expected compositional range of x ≤ 0.25 in the (Zr 1− x 4+ Al x 3+ )O 2− x /2 solid solution.