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Preparation of Zirconia Whiskers from Zirconium Hydroxide in Sulfuric Acid Solutions under Hydrothermal Conditions at 200°C
Author(s) -
Murase Yoshio,
Kato Etsuro
Publication year - 2001
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.1151-2916.2001.tb01076.x
Subject(s) - whiskers , whisker , cubic zirconia , sulfuric acid , zirconium , materials science , hydrothermal circulation , hydrothermal synthesis , chemical engineering , hydroxide , nuclear chemistry , inorganic chemistry , mineralogy , metallurgy , chemistry , composite material , ceramic , engineering
Mixtures of Zr(OH) 4 and ZrO 2 particles, ∼10 nm in size, were hydrothermally treated in 0.25–1.5 mol/L H 2 SO 4 solutions at a temperature of 200°C. After 3 h, very short ZrO 2 fibers, 10–30 nm in length, were obtained, with no other zirconium compounds observed. The particles grew with treatment time and resulted in whisker particles. In a higher concentration (3 mol/L) H 2 SO 4 solution, ZrO 2 whiskers were not obtained, and clear solutions resulted with the starting ZrO 2 particles remaining. It was concluded that Zr(OH) 4 was useful as a starting material and that nanosized ZrO 2 particles served as seed crystals for whisker formation.