(2020). Guest Editorial. Ferroelectrics: Vol. 561, No. 1, pp. vii-vii.

At the isothermal annealing below the crystallization temperature, dependences of the internal friction on time for the thin-film nanogranular composite consisting of crystalline nickel (Ni) and an amorphous material based on lead zirconate titanate [Pb0.81Sr0.04(Na0.5Bi0.5)0.15][(Zr0.575Ti0.425)]O3 have been studied. We have observed a relaxation in the amorphous phase of the composite. The structural

The temperature dependences of the resistivity ρ(T) of ceramic La1−xSrxMn1−yFeyO3 samples at x = 0.5, and y = 0, 0.02 and 0.10 are investigated in the temperature range of 5-300 K in magnetic field B up to 1 T. It was found that dependences ρ(T) with x = 0.5; y = 0.02, and 0.10 obey the Shklovskii–Efros-like variable-range hopping conductivity law ρ(T)=ρ0(T) exp[(T0/T)1/2]. This behavior is governed

Method of digital piezomaterials fabrication based on mixed composites of the “piezoelectric ceramics-polymer” system is presented. The materials intend for use as precursors in the manufacture of piezoelectric elements using the technology of layer-by-layer bonding of powders. The method of investigation of these materials and frequency dependences of their electromechanical properties is described

The theory of the direct magnetoelectric effect in a bilayer ferromagnetic—piezoelectric structure is presented with the exact consideration for electric fields, inhomogeneous over the thickness of the piezoelectric layer. The solution of the motion equations for a piezoelectric and ferromagnetic medium made it possible to numerically-analytically calculate the dependence of the natural frequency of

The object of the study was samples of commercial piezoelectric ceramics Pb0.95Sr0.05(Zr0.53Ti0.47)O3+1% Nb2O5 (PZT-19). A series of experimental studies of the kinetics of changes in the optical transmittance of the PZT-19 ceramic samples was carried out during exposure to the full spectrum of a PESL-SF2 11 W/865 E14 fluorescent lamp. The kinetics of restoring the initial optical transmittance of

The features of the frequency dependence of conductivity and the current-voltage characteristics in magnetoelectric composite ceramics 0.85BiFeO3–0.15MgFe2O4 in the temperature range (300–500) K and frequencies (10–500) kHz are studied.

The purpose of this work is to study the effect of rapid thermal annealing (RTA) with halogen lamps on the structural and phase characteristics of lead zirconate-titanate (PZT) films. The PZT thin films with a thickness of 1.0 ± 0.1 μm were deposited by high-frequency reactive plasma sputtering in an oxygen atmosphere on oxidized silicon and silicon substrates with orientation (100). After deposition

Based on our experience of spectral dielectric measurements and our literary knowledge, we simulate a medium with the properties of liquid water. The medium under consideration is a dense gas of particles in the form of solid spheres of two types—possessing either a dipole moment of a water molecule (1.84 D) or an elementary charge (1.6 * 10−19 C). Particles are bonded via ion-dipole interaction; they

This work is devoted to computer simulations of a viscoelastic media heating by standing cylindrical ultrasonic waves generated inside a cylindrical piezoelectric transducer with radial polarization. The transducer is assumed to operate on wall-thickness vibrational mode. Acoustic simulations were performed with the aid of two software packages: k-wave (acoustic simulations) and FeniCS (thermal simulations)

In this paper, the study of relaxation processes in ferroelectric ceramics under the influence of a dc electric field has been performed. To measure the field and time dependences of the complex elastic, dielectric, and piezoelectric parameters of ferroelectric ceramics, the impedance spectroscopy method and piezoelectric resonance analysis program were used. A comparative analysis of various characterization

A new Aurivillius Bi5Ti3Fe0.5Ni0.5O15 compound was prepared using the conventional ceramic technology. The features of the temperature dependences of the dielectric constant ε′ and the dielectric loss tgδ were studied in the temperature range from 300 to 750 K. These dependences indicate a significant conductivity contribution to the ε′ and tgδ as well as the presence of a relaxation process. The ac

In this work, in the framework of the Ginzburg-Landau phenomenological theory for phase transitions it was found that the structure of the main state of a nanoscale ferroelastic plate below the phase transition temperature can be heterogeneous and is “domain-like.” By the numerical solution of a nonlinear system of differential equations for the order parameter in the framework of elasticity theory

Samples of piezoactive composition 0.89PbMg0.33Nb0.66O3 (MZF)−0.11PbZr0.48Ti0.52O3 (PMN–PZT) by two-stage ceramic technology were obtained. The values of the effective piezomodule d31 = (600–1400) pC/N for the resulting material significantly exceed the values of d31 = 150 pC/N for the commercially available family of lead zirconate – titanate ceramics even at low bias electric field strength. The

The article presents a new method of electromechanical characterization of ferroelectric materials. The measurements of the complex elastic, electromechanical, and piezoelectric parameters of ferroelectric ceramics were fulfilled using the piezoelectric resonance analysis method. To study nonlinear processes occurring in ferroelectric ceramics under the external influences the dc electric field, dependencies

Based on the phenomenological theory of Landau–Ginzburg–Devonshire, the singularities of the phase transition in a thin ferroelectric film in external electric field are investigated depending on the film thickness and the type of polarization fixed on its planes. It was found that in electric field the phase transition shifts in temperature, and the shift value depends on the film thickness and the

In our work, we obtained and studied the samples of porous piezoelectric ceramics based on lithium – sodium niobate (LNN) with a pore content of 10, 20, 30, and 40 volume percent. An analysis of the structure, temperature and frequency dependences of the permittivity of the samples was carried out. It was shown that in all samples there are two main relaxation processes: in the regions of high (1 − 7 MHz)

The temperature dependences of the spectrum of polarization relaxation times above the temperature of the second-order phase transition of order-disorder type with relaxation Debye mode in a thin ferroelectric film are determined depending on its thickness and the degree of polarization fixation on the film surface. It has been established that the longest of the relaxation times τ1 behaves abnormally

The temperature dependences of the dielectric permittivity and dielectric loss tangent in the ferroelectric ceramic Ba0.8Sr0.2TiO3 have been studied at frequencies from 25 Hz to 120 Hz. It was found that the phase transition at the Curie point (ТС ≈ 338 K) is diffused in the temperature range of ∼ 30 K. The temperature dependence of the local order parameter plotted based on dielectric measurement

The dielectric properties of the bipolar SrTiO3/BaTiO3/SrTiO3 structures synthesized by pulsed laser sputtering on a single-crystal SrTiO3 substrate doped with Nb with a buffer conducting oxide sublayer of LaSrCoO3 are studied. It is shown that the structure has a transition temperature to the ferroelectric state approximately equal to 320°С. The transition into the polar phase has all the features

In this work, the frequency dependences of complex piezoelectric, dielectric, and elastic parameters of lead-free ferroelectric ceramics based on solid solutions of the (Na, Li)NbO3 system were studied in the frequency range up to 100 MHz. A complete set of complex parameters of lead-free ferroelectric ceramics was measured using the PRAP automatic iterative method. It was shown that the studied lead-free

The spectrum of oscillation of ferroelectric nanoparticles of different shapes was analyzed by the method of finding eigenvalues and eigenfunctions. The oscillation spectrum for elliptical particles obtained by an exact solution using numerical methods. The spectrum of eigenvalues of a particle of elliptic shape better coincides with the spectrum of a particle in the form of a parallelepiped of similar

An amorphous material based on multiferroic BiFeO3 was obtained, using melt quenching method. Its dielectric properties were studied within the temperature range −200 to 600°С. The material is characterized by a high dielectric permittivity ε ≈104 (at 200°С and a frequency of 100 Hz), due to the contribution of migration polarization. Using the DTA method, the glass transition temperature Tg ≈ 400°С

(2020). Correction. Ferroelectrics: Vol. 561, No. 1, pp. 162-162.

Structure, microstructure, dielectric, and piezoelectric properties of PZT-based hard piezoceramics PCR-8 sintered by different methods were studied. It is shown that hot pressing and spark plasma sintering contribute to an increase in the ceramics density and improve their functional parameters, as well as lower sintering temperature. The optimal technological conditions for the mass manufacturing

The time dependence behavior of the dielectric permittivity of lead lanthanum zirconate titanate transparent ceramic sample from the moment of the field application at certain temperatures after the zero-field cooled regime is compared to that exhibited by a single-crystal lead magnoniobate. The delay time of the phase transition from the glasslike to the field-induced ferroelectric state was determined

The influence of reverse proton exchange (RPE) and some types of surface pretreatment (exposure to Piranha or RCA-1 solutions or to HNO3+HF mixture) on the structure and properties of proton-exchanged layers has been studied in X-cut lithium niobate (LN). It has been shown that the rate of phase transitions in PE layers during RPE is greater than that during annealing at the same temperature. Pretreatment

The growth of requirements to frequency mixers adapter for high-power lasers stimulates the studies of domain kinetics in nonlinear ferroelectric crystals with the slanted polar axis. Forward domain growth after local polarization reversal by focused electron beam irradiation and domain interaction were studied in 0.5-mm-thick 36° Y-cut crystals of congruent lithium niobate. The dependences of domain

This study presents experimental results of investigating dielectric properties of ferroelectric composite prepared from Rochelle salt and cellulose nanoparticles under a weak electric field of 1 V/cm from 5 to 55 °C. It was found that along with the upper phase transition coinciding with those for bulk Rochelle salt (24 °C) detected due to the presence of Rochelle salt volume part and clusters, the

We investigate the effect of electric field on the properties of quasi-two-dimensional electron gas at the interface between ferroelectric oxide and insulating oxide in Ba0.8Sr0.2TiO3/LaMnO3 (BSTO/LMO) heterostructure. Interface conductivity measurements were performed by a four-point probe method before and after the effect of electric field on Ba0.8Sr0.2TiO3 ferroelectric film. We have shown that

Structure, microstructure, dielectric, ferroelectric, and local piezoelectric properties of perovskite ceramics in the systems (1-x)(K0.5Na0.5)NbO3 – x(Bi0.5Na0.5)TiO3 (x = 0 ÷ 0.1) and (1-x)(K0.5Na0.5)NbO3 – x(Bi0.5Na0.5)ZrO3 (x = 0.01 ÷ 0.05) have been studied. Improvement of dielectric parameters and effective d33 piezoelectric coefficient was obtained in compositions with x = 0.03 and 0.05, correspondingly

Effects of cation substitutions on crystal structure parameters, microstructure, dielectric and ferroelectric properties of ceramic solid solutions (Na0.5Bi0.5)(Ti1-xMgx)O3 with x = 0 ÷ 0.1 were studied. Phase transitions near 400 K demonstrate a pronounced relaxor behavior typical for (Na0.5Bi0.5)TiO3 (NBT) based compositions conditioned by presence of polar nanoregions in nonpolar matrix. Changes

In SrxBa1−xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature

BiFeO3 (BFO) thin films were studied to control their oxygen-related processing parameters in order to obtain specific electrical characteristics in terms of conductivity and dielectric relaxation. BFO thin films prepared with Fe and Bi excesses and post-annealed in oxygen atmosphere showed higher electrical conductivity and lower conduction activation energies than single phase ones. Distinct parameters

The time dependence of the switching current induced by the evolution of the statistical ensemble of cone-like domains in uniaxial ferroelectric is analyzed within modified Kolmogorov-Mehl-Johnson-Avrami (KMJA) theory. Proposed approach allows establishing the peculiarities of this integral characteristic brought about by the developed system of charged domain walls.

Domain structure evolution in congruent lithium niobate single crystals under multiple infrared laser pulse irradiation was studied. The structure of narrow domain rays appeared after the first pulse became denser with pulse number due to ray widening and intensive fingering, which led to increasing the domain walls density. The almost constant wall density in the central region of irradiated zone

Ferroelectric domain structure and local switching were studied in LiNbO3 thin films deposited by radio-frequency magnetron sputtering technique on Si (001) substrates in Ar and Ar(60%)+O2(40%) environments. The noticeable difference in surface morphology and ferroelectric domain structure of the investigated films was found. The films sintered in pure Ar environment demonstrated pronounced <0001>

Recent studies on piezoelectricity in 2D materials, such as graphene, have revealed their potential in multiple applications including microelectromechanical systems. In this work, we reveal piezoelectricity in few-layer graphene sheets deposited on amorphous Si3N4 membranes. The response in the center of square membrane of 6.7 × 6.7 mm2 size reaches about 14 nm at resonance and could be further enhanced

Low-frequency spectra are investigated in a series of strontium barium niobate crystals SrxBa1-xNb2O6 with chemical compositions x = 0.33, 0.5, 0.61, and 0.75 in a back-scattering X(ZZ) X¯ geometry and a wide temperature range including ferroelectric and paraelectric phases. It is shown that for all crystals studied, a central peak (CP) is clearly manifested in the vicinity of phase transition temperature

High-field nonlinear dielectric and piezoelectric properties of Fe2O3 doped PMnS-PZN-PZT high-power piezoelectric ceramics are investigated. Rayleigh analysis reveals the presence of contributions from lossless reversible domain wall motion and the associated decoupling of nonlinearity and losses. This behavior is attributed to the orderly distribution of defect pinning centers. With the increase in

Probes with high aspect ratio Pt/C nanowhiskers on the tops of Si cantilevers coated with a thin magnetic layer were fabricated. A simulation of the magnetic field strength gradient in the interaction of single magnetic domains with probes of various shapes is carried out. The optimal parameters of magnetic field detection were found, such as the probe geometry, material and thickness of the magnetic

(2020). Correction. Ferroelectrics: Vol. 558, No. 1, pp. 260-260.

(2020). Correction. Ferroelectrics: Vol. 558, No. 1, pp. 261-261.

Gold clusters are considered as widely used catalyst for chemical industry, but the efficiency of catalyst has been limited by the aggregation of the gold atoms, since the active sites are only located on the surface of the catalyst particles. In this paper the surface distribution of gold clusters influenced by spontaneous polarization and temperature is discussed. The morphology of the gold particle

This article is a comprehensive study of piezoelectric materials and provides information on surface analysis. In the main scope, the article is about examining surface analysis data and discussing its results. The results obtained by X-ray Spectroscopy (EDS) and also Scanning Electron Microscopy (SEM) technique used to understand the surface morphology of the piezoelectric material sample. Piezoelectric

Sodium-potassium niobate (Na1-xKxNbO3) ceramic pellets were prepared, near equimolar Na- K composition, by solid state reaction method with double sintering. Remnant polarization, coercive field, polarization current and converse piezoelectric coefficient (d*33) of the prepared samples were measured. The observed properties exhibit strong composition dependence- a morphotropic phase transition type

Lithium niobate is most well-known of optical material and could be characterised using stochastic spline regression. The aimed of this research is to find the best spline regression based on percentage of transmittance of lithium niobate and wavelength at three concentrations of ruthenium oxide (0%, 2%, and 4%) and to learn the behaviour of transmittance of lithium niobate if wavelength of visible

Pure mode axes of the 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-0.33PT) single crystals are investigated by slowness surfaces method. It is found only the Z-axis is a pure mode axis. The piezoelectricically stiffened Christoffel equation of the PMN-0.33PT crystal is solved in the rotating coordinate system. All of the single acoustic modes of thickness vibration are obtained. For the pure longitudinal mode

Energy harvesting from piezoelectric is proved to be a viable technology to source low power electronic devices. In this paper, piezoelectric energy harvester is designed such that the energy is harvested by utilizing the switching of the MOSFET in DC-DC converter, which becomes an integral part of modern industrial equipment. Energy harvesting is realized by piezoelectric and converse effect of piezoelectric

A new method for transporting droplets is presented to avoid directive radiation of surface acoustic wave (SAW). An interdigital transducer (IDT) is fabricated on a 128°-YX LiNbO3 piezoelectric substrate using microelectric technology. A droplet to be transported is placed on a steel ball, which is driven by SAW. The droplet on the steel ball is then transported together with the steel ball. 0.5ul

Structural, optical and electrical properties of multiwall carbon nanotubes (MWCNT) dispersed liquid crystalline (LC) mixture is extensively studied for electro-optic devices. A small amount of (0.1%) MWCNT is dispersed in cholesteryl stearate (CHS) and 4-dodecyloxybenzoic acid (12OBA) and its mixture is further characterized. Hydrogen bond between the mesogenic compounds are confirmed using FT-IR

The finite element method (FEM) is widely used in engineering, and the ANSYS program is accepted by researchers. In this paper, a step-down PZT-based (PZT-85) piezoelectric transformer is designed to explore the vibration and frequency characteristics of a piezoelectric transformer. The simulation results are in good agreement with the experimental measurements, despite small differences due to human

Piezoelectric ceramics are often subjected to heavy loading. Piezoceramic sheets are essential elements of piezoelectric devices. The vibration amplitudes and static capacitances of PZT5 soft piezoelectric discs with Φ10 × 1mm3 and PZT4 hard piezoelectric sheets with 7 × 7 × 0.7mm3 under compressive stress are studied. The experimental results show that the piezoelectric properties of PZT5 are improved

Bi0.75La0.25FeO3 sample has been fabricated by a novel hydrothermal-assisted co-precipitation method. The X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) studies confirmed that the sample was crystallized in orthorhombic (Pbnm) and rhombohedral (R3c) phases. Using differential thermal analysis (DTA), it is observed that the sample exhibits a Neel temperature (TN= 581 K) and Curie temperature

We report the investigation of BiFeO3 and Y2O3 gate stack for the metal-ferroelectric-insulator-field-effect-transistors (MFIS-FET) for nonvolatile memory applications deposited by sputtering. X-Ray diffraction and electrical characterization have been carried out to investigate the structural and ferroelectric characteristics respectively of the deposited individual films and their stack. Structural

A comparative study on the dynamic mechanical and electric properties was firstly performed on Ba1-xCaxTiO3 (x = 0.1 ∼ 0.25) ceramics. A diphasic ceramic composed of ferroelectric tetragonal Ba0.8Ca0.2TiO3 and normal dielectric orthorhombic Ba0.07Ca0.93TiO3 solid solutions was obtained near the solubility limit (x = 0.23). The ferroelectric to paraelectric phase transition was clearly characterized

Na0.685K0.315Nb1−yTay O3 (where y = 0, 0.01, 0.02, 0.03, 0.04, 0.05) based ceramics were synthesized by the conventional solid-state reaction process. The effects of (Ta) – doping on the phase structure and electrical properties of (NKNTaO3) were observed. The cell parameters were refined by High Score Plus software, using Rietveld method, The monoclinic Pm(6) space group was chosen in these refinements

In order to develop a mathematical modeling of the smart structure, the study consists of using, in first time, the finite element method and Euler-Bernoulli theory applied to a flexible beam divided into a finite number of elements. For this purpose, we define the beam represented by the imperfect FG material, partially bonded on both surfaces, four thin layers of piezoelectric materials used as sensors/actuators

Complex perovskites (1-x)Ba(Mg1/3Ta2/3)O3 – (x)Ba(Mg1/8Ta3/4)O3 (0 ≤ x ≤ 1) were investigated for possible solid solution and composite range using one pot metathesis process. This process lowers the synthesis temperature of Ba-Mg-Ta ceramics to just 1100 °C. Till x = 0.5 the powder X-ray pattern shows the presence of only Ba(Mg1/3Ta2/3)O3 phase. Above x = 0.5 both Ba(Mg1/3Ta2/3)O3 and Ba(Mg1/8Ta3/4)O3

Polycrystalline ceramics, SrBi4Ti4O15 (SBT) and Sr0.2Na0.4Nd0.4Bi4Ti4O15 (SNBT), were synthesized by solid state sintering method using planetary ball mill. The stoichiometric powders were ground for 10 hours. Single phase formation was established from the XRD results. The highest peak (119) was seen at 30°. X-ray diffraction results indicated decreased cell volume and orthorhombic distortion with