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High‐Pressure Phase Transitions in Zirconia and Yttria‐Doped Zirconia
Author(s) -
ALZYAB B.,
PERRY C. H.,
INGEL R. P.
Publication year - 1987
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.1151-2916.1987.tb04876.x
Subject(s) - tetragonal crystal system , monoclinic crystal system , raman spectroscopy , materials science , cubic zirconia , phase (matter) , yttria stabilized zirconia , phase transition , diamond anvil cell , atmospheric pressure , analytical chemistry (journal) , crystallography , doping , crystal structure , mineralogy , high pressure , chemistry , ceramic , thermodynamics , metallurgy , optics , geology , physics , oceanography , optoelectronics , organic chemistry , chromatography
Raman spectroscopy has been utilized to characterize the phase transformations and transition pressures in pure and doped zirconia containing 3, 4, and 5 wt% Y 2 O 3 . The pressure‐induced transformations were investigated to over 6 GPa (at room temperature) using a diamond anvil pressure cell. Pure zirconia single‐crystal samples transformed to a “new” tetragonal phase (different from the one obtained at high temperatures at atmospheric pressure) at about 4 GPa. The pressure transformation, like the temperature transition, was reversible and exhibited an approximately 0.45‐GPa hysteresis at room temperature. The 3 and 4 wt% Y 2 O 3 crystals underwent a monoclinic ( P 2 1/b ) to tetragonal ( P 4 2 nmc ) phase transition similar to that observed at high temperatures. This phase change was found to be irreversible on releasing the pressure. The 5 wt% Y 2 O 3 at atmospheric pressure consists of a tetragonal modification in a disordered cubic matrix; a gradual, but reversible, disordering transformation of the tetragonal precipitate takes place with pressure.