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Raman study of temperature‐induced phase transitions in lead hafnate (PbHfO 3 )
Author(s) -
Sharma Shiv K.,
Jayaraman A.,
Chowdhury C. Pal,
Wang S. Y.
Publication year - 1994
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.1250250508
Subject(s) - raman spectroscopy , tetragonal crystal system , isostructural , phase transition , antiferroelectricity , phase (matter) , chemistry , spectral line , materials science , analytical chemistry (journal) , crystal structure , crystallography , condensed matter physics , ferroelectricity , optics , physics , optoelectronics , organic chemistry , chromatography , astronomy , dielectric
Abstract Results of a high‐temperature Raman spectroscopic investigation up to 522 K carried out at ambient pressure on an antiferroelectric PbHfO 3 multi‐domain single crystal are reported. The changes in the Raman spectral features show that temperature‐induced phase transitions occur at 435 ± 1 and at 484 ± 1 K. The first transition is possibly to a tetragonal structure and the second is to the cubic perovskite phase. The behavior is consistent with the earlier x‐ray study of PbHfO 3 . No soft mode behavior associated with the transitions was detected in the Raman spectra of PbHfO 3 . The changes observed in the high‐temperature Raman spectra of PbHfO 3 are similar to those found in the spectra of isostructural PbZrO 3 .