Dielectric dispersion in Langmuir-Blodgett ferroelectric polymer films

Lotonov, A. M.; Ievlev, A.; Gavrilova, N. D.; Verkhovskaya, K. A.; Yudin, S. G.

doi:10.1134/s1063783406060485

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…Similar anomalies are typical of both thick films ( d > 1 µ m) and ultrathin films ( d < 0.1 µ m) [28,29]. In this respect, the dielectric characteristics were studied both during heating to temperatures above the phase transition point and during cooling from the paraelectric phase.…”

Section: Resultsmentioning

confidence: 78%

10.1007/s11451-008-3028-2

2010

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The temperature dependences of the real and imaginary parts of the complex permittivity of vinylidene fluoride-trifluoroethylene copolymer films at temperatures ranging from -40 to 140 ° C are determined in the frequency range 10 -1 -10 8 Hz. An analysis of the experimental data has demonstrated that the behavior of the dielectric characteristics of the copolymer in the course of heating to temperatures above the ferroelectric phase transition point and during subsequent cooling differs substantially. In the latter case, the high-frequency dielectric response exhibits properties characteristic of relaxor ferroelectrics. The observed features are discussed in terms of the competition of two mechanisms associated with the short-range and long-range forces.

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Section: Resultsmentioning

confidence: 78%

10.1007/s11451-008-3028-2

2010

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“…As the temperature increases, the g(T) value exhib its significant growth, which correlates to the well known increase in the dielectric permittivity [7,21], and exhibits a clearly pronounced hysteresis typical of the first order phase transition (Fig. 7).…”

Section: Discussion Of Resultsmentioning

confidence: 88%

Giant quadratic electro-optical effect during polarization switching in ultrathin ferroelectric polymer films

Blinov

Лазарев

Palto

et al. 2012

J. Exp. Theor. Phys.

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The low frequency quadratic electro optical effect with a maximum electro optical coefficient of g = 8 × 10 -19 m 2 /V 2 (i.e., four orders of magnitude greater than the standard high frequency value) has been studied in thin films of ferroelectric polymer PVDF(70%)-TrFE(30%). The observed effect is related to the process of spontaneous polarization switching, during which the electron oscillators of C-F and C-H dipole groups rotate to become parallel to the applied field. As a result, the ellipsoid of the refractive index exhibits narrowing in the direction perpendicular to the field. The field dependence of the electro optical coefficient g correlates with that of the apparent dielectric permittivity, which can be introduced under the condition of ferroelectric polarization switching. The observed electro optical effect strongly decreases when the fre quency increases up to several hundred hertz. The temperature dependence of the effect exhibits clearly pro nounced hysteresis in the region of the ferroelectric phase transition.

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“…One can see from the figure that the data at low frequencies show linear dependence. This means that we observe here the Universal Linear Low-Frequency Dispersion which is typical for wide class of dielectrics containing OH¢¢¢O hydrogen bonds (2.6-2.9 nm in length) and many other isolators with ionic conductivity: Erbium and yttrium formates, ferroelectrics triglycine sulphate, triglycine selenate, colemanite, VDF/TrFE copolymers, epoxy resin and other [6][7][8][9]12]. Figure 4 shows double-logarithmic plot of frequency dependence of conductivity s(f) for several temperatures for Holmium formate under application of electric field 20V/cm.…”

Section: Methodsmentioning

confidence: 93%

Dielectric Response of Holmium Formate Crystallohydrate at 100mHz–10MHz

et al. 2015

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The dielectric response of Holmium formate crystallohydrate was studied in the frequency range of 10 ¡1 -10 7 Hz at 20-70 C. Experimental data were analyzed within formalisms of dielectric permittivity, conductivity and dielectric modulus. Specific features of dielectric properties and conductivity which were detected are typical for crystallohydrates and ferroelectrics with hydrogen bonds. It is assumed that such anomalies are caused by changes in the dynamics of protons that participate in hydrogen bonds in the crystal structure.

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Dielectric dispersion in Langmuir-Blodgett ferroelectric polymer films

Cited by 8 publications

References 7 publications

10.1007/s11451-008-3028-2

10.1007/s11451-008-3028-2

Giant quadratic electro-optical effect during polarization switching in ultrathin ferroelectric polymer films

Dielectric Response of Holmium Formate Crystallohydrate at 100mHz–10MHz

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