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The dynamic permittivity of vinylidene fluoride-trifluoroethylene (70:30) copolymer films is measured over wide ranges of frequencies and temperatures. It is revealed that 15-to 45-nm-thick Langmuir-Blodgett films of the vinylidene fluoride-trifluoroethylene copolymer undergo a Debye-type...
Nineteen types of phase transitions in nonmagnetic crystals that exhibit only partial mixed ferroelectric-ferroelastic properties in the low-temperature phase are analyzed. A crystal-physical method is used to establish that all partial mixed ferroelectric ferroelastics are full...
The anomalous polarization of relaxor ferroelectrics (relaxors), such as solid solutions of barium-strontium niobate (SBN) and lead magnesium niobate (PMN), is studied in ac low-frequency (up to 10 −4 Hz) and dc electric fields. The results of studying dielectric hysteresis loops, polarization...
The dielectric constant of amorphous Bi 1.8 Pb 0.3 Sr 2 Ca 2 Cu 3− x K x O x ( x = 0.2–0.3) is measured as a function of the static electric field strength. It is found that, as the field strength increases, the dielectric constant decreases following a quadratic law. This behavior of the...
Bi 2 A n − 1 B n O 3 n + 3 ceramics are fabricated where A and B are ions of Ti, W, Pb, Nb, and Mo. The process of synthesis is studied, and the changes in the charge mass and volume during sintering are determined. The ceramic production process is optimized. The dielectric properties of the...
The electrical and dielectric properties of thin-film heterogeneous nanostructures of Co x (LiNbO 3 ) 100 − x were studied in a wide concentration range of the metallic phase at room temperature. The percolation threshold characteristic of granular metal-dielectric systems was found. At low...
This paper reports on the results of the investigation into the effect of mechanical stresses on the dielectric properties of PZT ferroelectric thin films. An external load G applied to the sample brings about an increase in the residual tensile stress along one of the axes of the film. It is...
Structural defects in a surface layer of the proton-exchanged waveguide layer formed on a substrate prepared from an X -cut lithium niobate single crystal are revealed and investigated using scanning electron microscopy and optical interference profilometry in combination with selective etching....
Four relaxation processes and one ferroelectric-paraelectric phase transition are revealed in vinylidene fluoride-hexafluoropropylene copolymers with different ratios of the components in the temperature range from −100 to 150°C. The relaxation process occurring at the lowest temperature is...
The Hartree-Fock formalism and density functional theory are used in first-principles calculations of the Landau-Ginzburg free-energy expansion coefficients in the Devonshire-Barrett one-ion model for BaTiO 3 , PbTiO 3 , and KNbO 3 . The Curie temperature T 0 and the Curie-Weiss constant are...
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