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Critical Particle Size and Phase Transformation in Zirconia: Transmission Electron Microscopy and X‐ray Diffraction Studies
Author(s) -
Srinivasan Ram,
Rice Larry,
Davis Burtron H.
Publication year - 1990
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.1151-2916.1990.tb06492.x
Subject(s) - crystallite , cubic zirconia , materials science , calcination , monoclinic crystal system , particle size , tetragonal crystal system , transmission electron microscopy , phase (matter) , precipitation , x ray crystallography , zirconium , grain size , diffraction , crystallography , mineralogy , chemical engineering , chemistry , metallurgy , ceramic , crystal structure , nanotechnology , optics , organic chemistry , physics , catalysis , engineering , meteorology
A study was undertaken to examine the crystallite size effect on the low‐temperature transformation of tettragonal zirconia. Zirconia weas prepared by precipitation from a solution of zirconium tetrachloride by adding ammonium hydroxide to produce a pH of 2.95. Portions of the sample, after drying, were calcined at 500°C for various time intervals. Phase transformation was followed by X‐ray diffraction; the data show that the tetragonal phase was initially formed and it was transformed to the monoclinic phase at longer periods of calcination. It was observed by TEM particle size and XRD crystallite size that the transformation does not appear to be due to a critical particle size effect.