FERROELECTRICS

Samin Anjum, Sumaya F. Kabir, Harinarayan Das, M. Al-Mamun et al.

This study investigated the efficacy of dextran-coated Zn0.6Co0.4Fe2O4 nanoparticles (ZnCoFe NPs) at low concentrations for localized and deeply seated cancer treatment through magnetic hyperthermia. Zinc–cobalt spinel ferrite nanoparticles were synthesized using the sol–gel method, coated with dextran, and subsequently characterized for their structural, morphological, and the…

M. Surekha, D. M. Potukuchi

Hysteresis, tilt angle, spontaneous polarization and Electro-Clinic effect were investigated for SmC* exhibited by a liquid crystal dimer, viz., 11OBA:M*SA:ABO11 with chiral center on spacer moiety. Primary order parameter tilt angle θ(T) growth agreed with Critical field model prediction, while secondary order parameter spontaneous polarization growth Ps(T) agreed with Mean fi…

Hui Wang, Yu Zheng, Peng Gao, Liang Gao et al.

Based on 0.655PMN-0.345PT piezoelectric ceramics, a novel piezoelectric vibration actuator was proposed. The model of the actuator was designed and fabricated by the manufacturing process. The grains of the PMN-PT ceramics were investigated by microstructure analyses. The performances of the proposed actuator were studied. The results showed that the actuator achieved a charge …

Piyush Patel, S. M. Vyas, Vimal Patel, Ravi Varasada et al.

Dielectric and impedance spectroscopy (20 Hz–2 MHz) of Bridgman-grown In2Se2.7Sb0.3 crystals reveals that Sb doping significantly alters electrical properties. Findings include strong low-frequency electrode polarisation, non-Debye relaxation, and conductivity transitioning from DC to correlated barrier hopping. The electric modulus formalism resolved two distinct grain and gra…

Alexander V. Solnyshkin, Alexander S. Sigov

These Proceedings present the articles based on the invited, oral, and poster presentations at the XXIII All-Russian Conference on Ferroelectrics (VKS-XXIII) held in Tver, Russia, October 03–06, 20...

A. Yu Pyatyshev, N. V. Sidorov, M. N. Palatnikov, P. P. Sverbil et al.

The results of a study of the structural perfection of crystals and ceramics of lithium niobate and lithium tantalate of various compositions are presented. In solid solutions of the LiNbxTa1-xO3 family with 0.4 ≤ x ≤ 0.6, lines were found in the Raman spectra, both of the first (in the range of 150–900 cm−1) and of the second order, located in the range of 900–2000 cm−1. Secon…

A. A. Nesterov, M. I. Tolstunov, A. V. Lebedeva, A. Y. Malykhin et al.

The aim of the research is to develop a technology of ceramic piezoelectric materials which сan be used in thermo cyclic mode at temperatures above 280 °C. This technology has been developed for the piezoelectric ceramics based on (1-x)PbTiO3 – xBa0.85Ca0.15Ti0.90Zr0.10O3 (x = 0.15–0.45). The use of low-temperature (380–400 °C) synthesis of ultrafine phase powders and stepwise …

V. N. Nechaev, A. V. Shuba

The features of phase transitions in ferroelectrics with incommensurate phases are discussed. The proposal that a second order phase transition from incommensurate to commensurate ferroelectric phase in a bulk material take place in the temperature range (TCl,TCh) is qualitatively consistent with the experiment. It has been shown that the temperature range varies significantly …

V. Yu. Topolov

Ferroelectric solid solutions with the formula (1−z)NaNbO3-zNa0.50Bi0.50TiO3 are studied to identify relationships between non-180° domain types in phases and their volume fractions. Modelling the two-phase regions with interlayers is performed to examine conditions for the complete stress relief in heterophase structures at variations of volume fractions of some domain types. …

S. V. Senkevich, D. A. Kiselev, V. P. Pronin, I. P. Pronin

The inhomogeneous distribution of the lateral piezoelectric response and surface potential over a spherulitic perovskite islands is studied. It is shown that the non-uniform distribution of the lateral piezoresponse is associated with the action of radial tensile mechanical stresses acting on the spherulitic island from the low-temperature pyrochlore matrix, as well as the form…

G. Yu. Sotnikova, A. V. Voronin, G. A. Gavrilov, V. Yu. Goryainov et al.

Results of the X-ray diffraction and scanning electron microscopic analysis of morphological changes in the piezoelectric PZT ceramic surface before and after plasma irradiation are presented. It is shown that repeated exposure to high energy density hydrogen plasma flows leads to a significant change in the structure and elemental composition of the near-surface layer. At the …

Ya. Yu. Matyash, N. V. Makinyan, A. V. Nazarenko, D. V. Stryukov et al.

Thin films of the ferroelectric relaxor Sr0.6Ba0.4Nb2O6 were grown by RF cathode sputtering on MgO(001) and MgO(110) substrates with a predeposited SrRuO3 layer. It was shown that in both cases the composition of the grown films corresponded to stoichiometric proportions, while the surface relief and cross-section differed significantly. It was found that the substrate orientat…

G. Yu Sotnikova, A. V. Voronin, G. A. Gavrilov, V. Yu Goryainov et al.

The study of the effect of a hydrogen plasma jet with an energy density of 0.2 MJ/m2, a fluence of 1023 ion/m2 and a pressure of 0.15 MPa on the physical properties of piezoelectric ceramics based on lead zirconate titanate (PZT) is presented. The main result is confirmation of the conservation of originally existing polarization with a slight decrease in the values of the main…

Evgenii V. Menshikov, Olga G. Maksimova

We present a method for calculating depolarizing fields in thin ferroelectric films within the framework of a discrete model, taking into account effects of screening by free charges of the film material itself and the electrodes. The formulas for the energy of dipole-dipole interactions were obtained from the multipole expansion of the screened Coulomb potential. Calculations …

I. P. Raevski, J. Zeng, K. Zhao, W. Ruan et al.

Temperature and field dependences of dielectric permittivity ε and unipolar electric field-induced strain S of the textured 0.675Pb(Mg1/3Nb2/3)O3−0.325PbTiO3 ceramics have been studied in the 25 °C … 200 °C range. Temperature dependences of both dielectric permittivity and converse piezoelectric modulus d*33 show anomalies corresponding to phase transitions between rhombohedral…

G. A. Geguzina, I. G. Popova, A. A. Panich

Ferroelectric and antiferroelectric phase transitions at Curie temperatures, TC, of the multiferroics, along with their magnetic phase transitions at Néel temperatures, TN, classical ferroelectric and antiferroelectric phase transitions, as well as rotational phase transitions of known perovskite oxides and fluorides ABX3, where X = O or F, at temperatures TR are considered. Th…

V. Yu. Topolov

Novel 2–2-type composites with two ferroelectric components are put forward, and hydrostatic piezoelectric coefficients dh* and gh*, and figure of merit dh*gh* of these composites are studied. Each composite with 2–1–2 connectivity contains the domain-engineered single crystal layers and ferroelectric ceramic/polymer layers. Hydrostatic parameters of the lead-free and lead-cont…

A. S. Sidorkin, L. P. Nesterenko, Y. Gagou, P. Saint-Gregoire

The dielectric properties of layered two-component structures consisting of a dielectric of strontium titanate SrTiO3 and a ferroelectric of lead titanate PbTiO3 are investigated. In these structures, a ferroelectric phase transition occurs at a temperature of 544 ˚С, which significantly exceeds the phase transition temperature of ferroelectric PbTiO3. This effect may be due to…

N. B. Darmaeva, E. A. Bikyashev, A. V. Motseyko, V. A. Shuvaeva et al.

In this work we synthesize (1-x)PbMg1/3Nb2/3O3 – xLaMg2/3Nb1/3O3 (x = 0 − 0.15) solid solutions with different degrees of long-range atomic ordering by varying the thermodynamic history of the samples. The dielectric properties show strong dependence on atomic ordering. The emergence of long-range atomic ordering in PbMg1/3Nb2/3O3 upon increasing x is explained by Monte Carlo c…

P. A. Abramov, M. G. Konstantinova, N. A. Shvetsova, M. A. Lugovaya et al.

In this work, dependences of complex electromechanical parameters of rectangle-shaped piezoceramic elements on the aspect ratio, i.e., the ratio between length (W2) and width (W1) were studied and analyzed. Rectangle-shaped samples of the PZT type dense and porous piezoceramics with the aspect ratio G = W2/W1 in the range from 1 up to 6 and equal thickness were prepared and stu…