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

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 C2(Z) local sites symmetries to σv(YZ) sites maintaining the same factor group C2v. An assignment of the modes in the metastable phase is presented. Copyright © 2000 John Wiley & Sons, Ltd.

[1]  I. Guedes,et al.  Temperature-uniaxial pressure phase diagram of KH 2 PO 4 , 1999 .

[2]  Moreira,et al.  Phase transition in potassium dihydrogen phosphate induced by an applied static electric field. , 1996, Physical review. B, Condensed matter.

[3]  J. Filho,et al.  Phase transitions in KDP induced by uniaxial pressure , 1994 .

[4]  J. Filho,et al.  Reversibility of a Phase Transition in KDP under Uniaxial Stress , 1993 .

[5]  F. Melo,et al.  Anharmonic Effects in KDP near the Ferroelectric Phase Transition , 1992 .

[6]  F. Melo,et al.  New phase transition in kdp , 1992 .

[7]  D. Rousseau,et al.  Normal mode determination in crystals , 1981 .

[8]  R. Gammon,et al.  A light-scattering survey of critical behavior in the phase diagram of KH2PO4 , 1980 .

[9]  V. Schmidt,et al.  Pressure-induced tricritical point in the ferroelectric phase transition of KH_{2}PO_{4} , 1978 .

[10]  P. Peercy.  Measurement of the ''soft'' mode and coupled modes in the paraelectric and ferroelectric phases of KH/sub 2/PO/sub 4/ at high pressure , 1975 .

[11]  E. Nakamura,et al.  X-Ray Study of High-Temperature Phase Transitions in KH2PO4 , 1975 .

[12]  J. Scott.  Soft-mode spectroscopy: Experimental studies of structural phase transitions , 1974 .

[13]  G. Samara,et al.  Pressure and Temperature Dependences of the Dielectric Properties and Raman Spectra of RbH2PO4 , 1973 .

[14]  T. C. Damen,et al.  Temperature Dependence of the Ferroelectric Mode in KH2PO4 , 1968 .

[15]  Kenji K. Kobayashi.  Dynamical Theory of the Phase Transition in KH2PO4-Type Ferroelectric Crystals , 1968 .

[16]  R. Blinc.  On the isotopic effects in the ferroelectric behaviour of crystals with short hydrogen bonds , 1960 .

[17]  B. Frazer,et al.  X‐ray analysis of the ferroelectric transition in KH2PO4 , 1953 .

[18]  Yutaka Takagi,et al.  Theory of the Transition in KH2PO4. (I) , 1948 .

[19]  W. P. Mason.  The Elastic, Piezoelectric, and Dielectric Constants of Potassium Dihydrogen Phosphate and Ammonium Dihydrogen Phosphate , 1946 .

[20]  John C. Slater,et al.  Theory of the Transition in KH2PO4 , 1941 .