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Evolution of the Phase Content of Zirconia Powders Prepared by Sol‐Gel Acid Hydrolysis
Author(s) -
Rivas Patricia C.,
Martínez Jorge A.,
Caracoche María C.,
Rodríguez Agustín M.,
García Alberto R. López,
Pavlik Robert S.,
Klein Lisa C.
Publication year - 1998
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.1151-2916.1998.tb02314.x
Subject(s) - tetragonal crystal system , zirconium , cubic zirconia , materials science , amorphous solid , annealing (glass) , monoclinic crystal system , hydrolysis , sodium hydroxide , phase (matter) , sol gel , metastability , analytical chemistry (journal) , crystallography , chemical engineering , mineralogy , nuclear chemistry , chemistry , crystal structure , metallurgy , organic chemistry , nanotechnology , ceramic , engineering
The evolution of the phase content in zirconia powders that have been prepared by sol—;gel acid hydrolysis has been investigated using the perturbed‐angular‐correlation (PAC) technique and X‐ray diffractometry. As a consequence of performing annealing treatments at increasing temperatures between room temperature and 1000°C, the amorphous starting material transforms to the tetragonal form and then to the monoclinic form. The metastable tetragonal phase exhibits two hyperfine components, one of which describes very defective zirconium surroundings. The evolution of PAC relative fractions is in agreement with the diffraction results. The durability of the samples in sodium hydroxide seems to increase as the relative amount of the most‐defective zirconium surroundings of the tetragonal form increases.