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Metastable ferroelectric phase in potassium dihydrogen phosphate induced by a static electric field
Author(s) -
Varela A. T.,
Melo F. E. A.,
Barbosa Neto N. M.,
Freire P. T. C.,
Guedes I.,
Sasaki J. M.,
Mendes Filho J.
Publication year - 2000
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 - 10.1002/1097-4555(200010)31:10<915::aid-jrs617>3.0.co;2-s
Subject(s) - metastability , ferroelectricity , raman spectroscopy , electric field , raman scattering , phase transition , potassium , chemistry , phase (matter) , ion , phosphate , condensed matter physics , crystallography , materials science , physics , optics , dielectric , optoelectronics , organic chemistry , quantum mechanics
Raman scattering experiments show that potassium dihydrogen phosphate crystals undergo a metastable ferroelectric phase transition induced by a static electric field at 119 K. Qualitative changes occur in the Raman spectra of all possible scattering geometries for applied d.c. electric field intensities of the order of 4 kV cm −1 . The phase transition is induced by rotation of phosphate ions changing from C 2 ( Z ) local sites symmetries to σ v ( YZ ) sites maintaining the same factor group C 2 v . An assignment of the modes in the metastable phase is presented. Copyright © 2000 John Wiley & Sons, Ltd.