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Formation Mechanism of Hydrous‐Zirconia Particles Produced by Hydrolysis of ZrOCl 2 Solutions
Author(s) -
Matsui Koji,
Ohgai Michiharu
Publication year - 1997
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.1151-2916.1997.tb03077.x
Subject(s) - cubic zirconia , particle size , ion , transmission electron microscopy , hydrolysis , particle (ecology) , materials science , chemical engineering , inorganic chemistry , chemistry , mineralogy , ceramic , nanotechnology , metallurgy , geology , organic chemistry , oceanography , engineering
The secondary particle size of hydrous‐zirconia fine particles that have been produced by the hydrolysis of various ZrOCl 2 solutions, with and without the addition of NH 4 OH or HCl, was measured using transmission electron microscopy to investigate the effects of the H+ and Cl−ion concentrations on the formation of secondary particles. The average secondary particle size of hydrous zirconia increased as the H+ion concentration increased, attaining a maximum of 200 nm at an H−ion concentration of 0.44 moldm‐3. Further increases in the H+ion concentration then caused a decrease in the average particle size. The present experimental results revealed that the secondary particle size of hydrous zirconia is controlled primarily by the concentration of H+ ions that are produced during hydrolysis. The formation mechanism for the secondary particles in hydrous zirconia was determined on the basis of the present experimental results.