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Nonstoichiometry of ZrO 2 and Its Relation to Tetragonal‐Cubic Inversion in ZrO 2
Author(s) -
RUH ROBERT,
GARRETT HAROLD J.
Publication year - 1967
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.1151-2916.1967.tb15099.x
Subject(s) - tetragonal crystal system , monoclinic crystal system , cubic zirconia , materials science , zirconium , solubility , mineralogy , atmospheric temperature range , lattice constant , crystallography , analytical chemistry (journal) , metallurgy , crystal structure , chemistry , thermodynamics , ceramic , diffraction , optics , physics , chromatography
The system Zr‐O was studied in the composition range 50 to 66.7 at.% O by metallographic analysis, high‐temperature X‐ray analysis, and lattice parameter determinations at room temperature. The solubility of zirconium in zirconia was determined from 1200° to 2000°C, and the cubic‐tetragonal inversion temperature of ZrO 2 was shown to be lowered to approximately 1490°C for samples containing α‐Zr and oxide phase. Alpha zirconium has greater solubility in the cubic phase than in the tetragonal phase, and the inversion is revealed, in samples quenched from the cubic field, by the exsolution of α‐Zr, which is metallographically characterized as striations. At room temperature, the striations are oriented with the 111 and 11° planes of monoclinic zirconia.