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Metastable ferroelectric phase in potassium dihydrogen phosphate induced by a static electric field

, , , , , , and . JOURNAL OF RAMAN SPECTROSCOPY, 31 (10): 915-919 (2000)
DOI: 10.1002/1097-4555(200010)31:10<915::AID-JRS617>3.0.CO;2-S

Abstract

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 sigma(upsilon)(YZ) sites maintaining the same factor group C-2 upsilon. An assignment of the modes in the metastable phase is presented. Copyright (C) 2000 John Whey & Sons, Ltd.

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