Relaxaticnal dynamics of hydrogen-bonded ferroelectrics

Mizeris, R.; Grigas, J.; Levitsky, R. R.; Zachek, I. R.; Sorokov, S. I.

doi:10.1080/00150199008018767

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The results presented in figures 2-4 indicate that the fundamental ferroelectric dispersion appears in the microwave-frequency region . The relaxational-soft-mode dynamics reveals itself in the frequency region characteristic for the H-bonded ferroelectrics [10]. On approaching the Curie temperature, the macroscopic relaxation time reaches the value τ = 4×10 −10 s. This value is comparable with that of other hydrogen-bonded ferroelectrics like TGS-family crystals [11], CsH 2 PO 4 [12] and RbD 2 PO 4 [13].…”

Section: Dielectric Dispersion Of the Gpi Crystalmentioning

confidence: 62%

Dielectric dispersion and vibrational studies of a new ferroelectric, glycinium phosphite crystal

Baran

Bator

Jakubas

et al. 1996

J. Phys.: Condens. Matter

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The dielectric dispersion in glycine phosphite crystal over the frequency range 30-1000 MHz is presented. Ferroelectric dispersion of the Debye type along the b-axis occurs in the microwave-frequency region and is caused by a single relaxational soft mode. The powder IR (at low temperatures between 300 and 14 K) and FT Raman spectra in the region between 4000 and 80 cm −1 are measured. DSC measurements for the GPI and deuterated crystals are performed. The results confirm the order-disorder nature of a proper ferroelectric phase transition of second order.

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Section: Dielectric Dispersion Of the Gpi Crystalmentioning

confidence: 62%

Dielectric dispersion and vibrational studies of a new ferroelectric, glycinium phosphite crystal

Baran

Bator

Jakubas

et al. 1996

J. Phys.: Condens. Matter

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“…The ferroelectric dispersion in the vicinity of T , begins in the megahertz frequencies region and ranges up to the short millimeter waves as in other H-bonded ferroelectrics (Mizeris, Grigas et al, 1990). Figures 1 and 2 show the temperature dependences of the real and imaginary parts of the complex dielectric permittivity E* = E' -id' of TAAP along the [loll direction at several frequencies within the ferroelectric dispersion region.…”

Section: Resultsmentioning

confidence: 97%

“…The results obtained in the region of fundamental ferroelectric dispersion are presented in Figures 4 and 5. The relaxational soft mode dynamics reveals itself in the frequency region characteristic for H-bonded ferroelectrics (Mizeris, Grigas et al, 1990).…”

Section: Resultsmentioning

confidence: 98%

Microwave dielectric dispersion in ferroelectric telluric acid ammonium phosphate

1992

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The paper presents the results of the investigation of dielectric dispersion in monoclinic telluric acid ammonium phosphate crystal over the frequency range 1 MHz to 77 GHz It is shown that ferroelectric dispersion of the Debye type along the direction perpendicular to the plane (101) occurs in the frequency range 10' to 10" Hz and is caused by a single relaxational soft mode. The relaxational soft mode is caused by the flipping motion of protons between two potential minima in a hydrogen bond. The frequency of the flipping proton mode in the paraelectric phase varies according to v, = 0.94 (T -To) GHz and decreases to 1.75 GHz at T, = 317.3 K. The relaxational mode gives the main contribution to the high static dielectric permittivity of this crystal which fits the Curie-Weiss law. The results confirm the order-disorder nature of a proper ferroelectric phase transition of second order.

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