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Phonons and phase transitions in zirconia
Author(s) -
Perry C. H.,
Lu F.,
Liu D. W.,
Alzyab B.
Publication year - 1990
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250210909
Subject(s) - tetragonal crystal system , monoclinic crystal system , raman spectroscopy , phonon , materials science , phase transition , crystallography , phase (matter) , hysteresis , molecule , condensed matter physics , crystal structure , nuclear magnetic resonance , chemistry , optics , physics , organic chemistry
The martensitic‐austenitic phase transition in zirconia was investigated as a function of temperature and pressure using Raman and IR spectroscopy. The frequencies and symmetries of the phonon modes corresponding to the monoclinic (M), C 2h 5(4 molecules per unit cell) structure were identified at 300 K and 1 atm. The temperatureinduced transition to the tetragonal (TI), D 4h 15structure (2 molecules per unit cell) showed thermal hysteresis (1225 ↔ 1425 K). The corresponding pressure‐induced transition at room temperature showed a pressure hysteresis (3.4 ↔ 3.95 GPa). However, the structural transition was to a different tetragonal modification (TII) with D 2h or C 4v symmetry with 4 molecules per unit cell.