High-pressure phase transitions in zirconia and yttria-doped zirconia

Journal Article · Thu Oct 01 04:00:00 EDT 1987 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1987.tb04876.x· OSTI ID:5046196

Alzyab, B; Perry, C H; Ingel, R P

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/sub 2/O/sub 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/sub 2/O/sub 3/ crystals underwent a monoclinic (P2/sub 1/b) to tetragonal (P4/sub 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/sub 2/O/sub 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.

• Research Organization: Physics Dept., Northeastern Univ., Boston, MA (US)
• OSTI ID: 5046196
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Journal Issue: 10 Vol. 70:10; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
COMPRESSION
CRYSTAL DOPING
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
IMPURITIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RAMAN SPECTRA
SPECTRA
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES