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Formation Mechanism of Hydrous‐Zirconia Particles Produced by Hydrolysis of ZrOCl 2 Solutions: II
Author(s) -
Matsui Koji,
Ohgai Michiharu
Publication year - 2000
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.1151-2916.2000.tb01398.x
Subject(s) - monoclinic crystal system , transmission electron microscopy , ion , cubic zirconia , particle size , hydrolysis , particle (ecology) , materials science , chemical engineering , inorganic chemistry , crystallography , crystal structure , chemistry , ceramic , nanotechnology , organic chemistry , metallurgy , geology , oceanography , engineering
The primary and secondary particle sizes of monoclinic hydrous‐ZrO 2 particles produced by the hydrolysis of various ZrOCl 2 solutions, with and without the addition of NaCl, CaCl 2 , or AlCl 3 , were measured using X‐ray diffraction and transmission electron microscopy in order to clarify the formation mechanisms of primary and secondary particles. The primary particle size of hydrous ZrO 2 , under a constant ZrOCl 2 concentration, decreased monotonously with increasing Cl − ‐ion concentration. On the contrary, the secondary particle size increased monotonously with increasing Cl − ‐ion concentration. The present experimental results revealed that the primary and secondary particle sizes of hydrous ZrO 2 are controlled primarily by the concentrations of H + and Cl − ions produced during hydrolysis, and are independent of the type of added metal ions. The formation mechanisms of the primary and secondary particles of hydrous ZrO 2 were determined on the basis of the present experimental results.