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Growth of Monoclinic ZrO 2 Thin, Flaky Crystals by Hydrothermal Decomposition of Zirconium Oxide Sulfate Crystals
Author(s) -
Kato Eturo,
Hirano Masanori,
Nagai Akihiro
Publication year - 1995
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.1151-2916.1995.tb08652.x
Subject(s) - monoclinic crystal system , sulfuric acid , nucleation , materials science , aqueous solution , zirconium , crystallography , cubic zirconia , hydrothermal circulation , decomposition , hydrothermal synthesis , oxide , mineralogy , chemical engineering , inorganic chemistry , crystal structure , chemistry , metallurgy , ceramic , organic chemistry , engineering
Thin platelike hexagonal crystals of zirconium oxide sulfate (ZOS) with a chemical composition of Zr 3 O 5 SO 4 . n H 2 O were previously synthesized by the hydrolysis of an aqueous solution of 2 mol/L ZrOSO 4 at 240°C. The ZOS particles obtained were hydrothermally treated again in dilute sulfuric acid solution (<0.15 mol/L) at 240°C. The decomposition of ZOS and the nucleation and growth morphology of the monoclinic ZrO 2 crystals were automatically controlled with increasing sulfuric acid released by the decomposition of ZOS, and were influenced by the morphology of ZOS as precursors. Anisotropic monoclinic ZrO 2 single crystals, elongated thin and flaky particles (length: >2 (Am; width: about 0.1 μm; thickness:«0.01 μm), could be obtained under some conditions without the coexistence of another type of anisotropic ZrO 2 fibrous twin crystal.