(2020). Obituary: James F. Scott (1942–2020) Ferroelectrics: Vol. 568, No. 1, pp. 1-3.

(2020). In Memoriam of Professor James F. Scott. Ferroelectrics: Vol. 568, No. 1, pp. 4-4.

Abstract (Na0.5Bi0.5)0.94Ba0.06TiO3 + 0.3 wt.% Sm2O3 (named NBT-BT) lead-free piezoelectric ceramics were prepared by normal sintering. The effect of atmosphere sintering on NBT-BT ceramics was investigated through X-ray diffraction, dielectric, ferroelectric and piezoelectric characterizations. Real (Z′) and imaginary (Z″) parts of the complex impedance of the materials were also investigated. Dielectric

Abstract An influence of hyper-hardening on structure and mechanical properties of ceramic solid solutions (SS) Li0.12Na0.88TayNb1–yO3 with tantalum concentrations у = 0.05; 0.25; 0.4 has been revealed. The researched was carried out using X-ray diffraction and scanning probe microscopy methods. Two ferroelectric phases co-exist in initial non-hardened SS Li0.12Na0.88TayNb1–yO3: hexagonal R3cH and

Abstract In the present study, we have prepared the [Ba(Nd0.075Ti0.85Nb0.075)O3]0.30–[(Na0.5Bi0.5)TiO3]0.70 ceramic through solid-state double sintering route. New equations which were proposed by us earlier were used to describe and model the electromechanical, AC and DC resistivity data. The activation energy for resonance and anti-resonance at 300 K is 30.28 and 30.11 meV; whereas the value is 38

Abstract [(Bi1/2Na1/2)0.94Ba0.06]0.97La0.02TiO3 (BNT-BLT) lead-free anti-ferroelectric ceramics were synthesized by a conventional solid-state.By analyzing TGA and DSC curves, the material should be calcined at about 800 °C. The effects of different milling time on the microstructure of the materials were also studied. Microstructures analysis and the calculation from the X-ray diffraction results

Abstract The effect of the indium oxide (In2O3) dopant on the electrical properties of the lithium tantalate (LiTaO3) thin film-based sensor was investigated in this study. LiTaO3 thin film was made on p-type Si (100) substrates by applying the chemical solution deposition (CSD) method. The LiTaO3 thin film was annealed at the temperature of 850 °C for 15 h. Surface morphology and elemental characterization

Abstract Barium Strontium Titanate (BST) is a material that has a dielectric constant and high load storage capacity. BST is made with 3 variations namely BST without container, BST in Niobium Oxide container, and BST in chlorophyll container. Percentage of container mass is 5% and 10% of BST mass. The method used is Chemical Solution Deposition (CSD). The process of growing thin films is done using

Abstract Ferroelectric domain structures have attracted much attention due to their potential applications in storage. In this paper, the molecular dynamics method based on shell model is employed to simulate the uniaxial tensile strain applied to the BaTiO3 thin film, and the effect of strain on the polarization domain structure of BaTiO3 thin film is discussed. The results show that with the increase

Abstract In recent years, research progress in terahertz devices has affected the development of terahertz communications. In this article, an asymmetric metamaterial coated with the GaAs layer is proposed and numerically demonstrated for terahertz wave optical switching. Based on the Fano resonance of the asymmetric metamaterial, the modulation depth of 80% for Fano peak can obtained by changing the

Abstract Binary ( AIIIBIIIO3) and ternary ( AIIBβ11Bβ22O3) ferroelectrics-magnetics with the perovskite structure, containing the 3d-metal atoms, are investigated. Some correlations between their ferro- or antiferroelectric (TC) and magnetic (TN) phase transition temperatures and their interatomic A-O ( δAO), and B-O ( δBO) bonds strains, determined with using of quasi-elastic structure model, have

Abstract The influence of double sintering temperature on the phase structure, micro-structure and piezoelectric properties of Ba1-xCaxZr0.1Ti0.9O3 (x = 0.055) double sintered ceramics has been systematically studied. The pellet sample preparation and characterization have been reported in this paper. The converse piezoelectric properties of the Ba1-xCaxZr0.1Ti0.9O3 (x = 0.055) were observed. Depending

Abstract The solid solution of (Ba5TbTi3V7O30)x(BiFeO3)1-x has been synthesized by solid-state reaction technique with different x values. XRD (X-Ray Diffractogram) study confirms the formation of single-phase compound for x = 1. Grain morphology has been studied by Scanning electron microscope (SEM: JOEL-IT300). By Impedance Analyzer (HIOKI-IM3536) dielectric properties such as dielectric constant

Abstract In this work, we have studied the electrical response of a sandwiched piezoelectric transducer as a function of the height of a water column used as an acoustical load. This study covers investigations about the behavior of resonance, anti-resonance, electromechanical coupling factor, motional resistance, and mechanical loss. The results show that the performance of the transducer is dependent

Abstract A novel perovskite La0.86Cu3Ti3.42Al0.58O12 (LCTAO) ceramic was fabricated by a conventional solid-state method, and the dielectric property was systematically investigated. Pure phase with a body-centered cubic structure was confirmed by X-ray diffraction. High dielectric permittivity was performed in wide temperature and frequency ranges. Impedance spectroscopy analysis demonstrated microstructure

Abstract In this work, the magnetic properties of the WSe2 monolayer with different nonmetals (B, C, F, N, and O) are studied by the ab initio calculations. Different behavior shows up by applying the normal strain. Under the normal strain, the magnetism becomes tunable except for the B and O adatoms. Then, the magnetic coupling between two nonmetals has been checked. A transformation from ferromagnetic

Abstract The photoelectric properties of pristine, Mn-doped, Fe-doped and Co-doped graphene are investigated by DFT investigation. Doped graphene exhibits interesting tuning of electronic and optical properties. The gap value of Mn-doped graphene is the largest, 0.312 eV, then Fe-doped graphene, 0.214 eV, and Co-doped graphene, 0.070 eV. The absorption peaks of doped graphene become weak, especially

Abstract In the present study, simulation of polarization data using modified Glazounov equation (T & E simultaneously) of Barium Titanate based normal and relaxor ferroelectrics (i.e. BaTiO3 and Ba(NdxTi(1-2x)Nbx)O3) as proposed by us was carried out. These materials were prepared through sol-gel and solid state double sintering route. Modified Glazounov equation describes and model the experimental

Abstract Ho-modified NBT-BT ferroelectric ceramics were synthesized by a conventional solid state reaction. The changes in crystal structure and identification of functional groups in the prepared ceramics were studied by XRD and Raman studies. T-dependent dielectric study reveals a diffuse dielectric phase transitions were observed in the intervals of 200– 300°C. A thermal stable dielectric constant

Abstract The original magnesium titanate powders were pre-sintered, and the 0.95MgTiO3-0.05CaTiO3 (95MCT) ceramics were prepared by the pre-sintered magnesium titanate showed better dielectric properties than by the original powders. Because the magnesium titanate (MgTi2O5) phase was not detected. Then the microwave patch antenna was designed by the prepared ceramic measured at 2.8 GHz exhibited a

Abstract In order to clarify ordering mechanisms of ferroic phase transitions in double fluoride salts (NH4)3SnF7, (NH4)3GeF7 and (NH4)3TiF7, their Raman scattering spectra have been studied in wide ranges of frequencies (20–3400 cm−1) and temperatures (8–410 K). Substitution of the central ion in the octahedron groups was found to change not only the phase transition types and sequences, but to modify

Abstract In order to investigate the magnetic properties and the ground state phase diagrams of the transition metal oxide perovskite-type Pb(Fe1/2Nb1/2)O3, we use the Monte Carlo simulations under the Metropolis algorithm. For this purpose, we propose a Hamiltonian to model this compound when varying different exchange coupling interactions. In a first step, we elaborate the ground state phase diagrams

(2020). Guest Editorial. Ferroelectrics: Vol. 567, Special Issue in Honor of Professor Stanislav A. Grindev on the Occasion of His 83rd Birthday, pp. vii-viii.

(2020). A Recollection of Professor Stanislav A. Gridnev. Ferroelectrics: Vol. 567, Special Issue in Honor of Professor Stanislav A. Grindev on the Occasion of His 83rd Birthday, pp. ix-ix.

(2020). Tribute to Professor Stanislav A. Gridnev. Ferroelectrics: Vol. 567, Special Issue in Honor of Professor Stanislav A. Grindev on the Occasion of His 83rd Birthday, pp. xi-xi.

Abstract We performed an analysis of the phase diagrams and piezocaloric properties of fluorine–oxygen ferroics (NH4)2MeOxF6-x (Me: W, Mo, Nb; x: 1, 2) with orthorhombic symmetry. The nature of the influence of chemical pressure on the caloric efficiency has been elucidated. Substitutions of central atoms, Mo → W and Nb → W, lead to an increase in absolute and integral piezocaloric effects.

Abstract In this work, we use a previously improved technique for constructing a coincident site lattice for crystals with a perovskite structure. A method has been developed for finding atomic arrangements of various elements in grain boundaries based on a specially developed algebra. Possible compositions of chemical elements for different grain boundaries, charge states of mating planes at the grain

Abstract The regression analysis of the temperature dependences of the components of the elastic compliance tensor Sij in the tetragonal phase and the inverse permittivity coefficients 1/εij in the cubic and tetragonal phases is performed in single crystal BaTiO3. Two modified logarithmic functions having a critical temperature are proposed that approximate well the experimental results of 1/εij(t)

Abstract The structural phase transition P63/mmc → P63cm in hexagonal YGaO3 crystal is studied by first-principles methods. From lattice dynamics calculations it was obtained that the mechanism of transition into polar phase is similar to the one in isostructural YMnO3 crystal. As a result of calculations the improper ferroelectricity and electrical polarization were revealed in YGaO3.

Abstract Within modified proton ordering model of quasi-one-dimensional CsH2PO4 type ferroelectrics with hydrogen bonds with taking into account linear in strains ε6 and ε4 contributions into energy of proton system, but without taking into account tunneling, within the two-particle cluster approximation their thermodynamic characteristics are studied and calculated. At the proper choice of the parameters

Abstract The paper reports results on the large hydrostatic parameters of novel three-component 2–2-type composites based on [011]-poled relaxor-ferroelectric single crystals. The role of the rotation of the main crystallographic axes X and Y in forming the considerable hydrostatic piezoelectric response is studied. The composite consists of the single-crystal and 0–3 corundum ceramic/polyethylene

Abstract The temperature evolution of crystal structure and ferroelectric order parameter η(T) in nanocomposite materials “SBA-15 + NaNO2” have been studied by neutron diffraction. The large (∼15 K) temperature hysteresis in dependences of η(T) on heating and on cooling has been observed. It is shown that a cause of this effect is an influence of elastic strains arising upon heating and leading to

Abstract Results of calorimetric and dielectric studies of ferroelectric composite (C6H16NBr)1-x/(PbTiO3)x (x = 0.1, 0.2, 0.3) are presented. It was shown that addition of lead titanate leads to a change of the sequence in structural phase transitions in diisipropylammonium bromide. In the temperature range 423–411 K, two phases of C6H16NBr (ferroelectric P21 and non-ferroelectric P212121) are coexist

Abstract The dielectric properties of a composite material obtained by embedding of the Rb2ZnCl4 salt into a matrix of porous Al2O3 film with an average pore diameter of about 300 nm were studied within the temperature range 110–350 K. A wide temperature hysteresis of dielectric permittivity exceeding the range of experimental temperatures was revealed. A broad maximum of dielectric permittivity was

Abstract The repolarization process of Rb2ZnCl4 crystals under the influence of a harmonic electric field in the ferroelectric phase in the vicinity of the domain structure freezing temperature T*≈150 K was studied using the harmonic analysis method. The study of current density harmonics that occur in the sample under the influence of a harmonic field allowed to build a dependence of the electric

Abstract The stability of high-symmetry P4mm polar phase in eleven ferroelectric perovskite superlattices with the polar discontinuity is studied from first principles. In most superlattices, this phase exhibits either the ferroelectric or the antiferrodistortive instability, or both of them. The structure of the ground state and, for a number of systems, also of metastable phases in these superlattices

Abstract We studied the bilayer heterostructures with the different consequence of the Ba0.4Sr0.6TiO3 and Ba0.8Sr0.2TiO3 layers grown on the single-crystal MgO and Si substrates. The thermodynamic theory for the heterostructures was developed. Based on the experimental data, we determined the thermal deformation parameters in the Ba0.4Sr0.6TiO3 and Ba0.8Sr0.2TiO3 layers, forming the bilayer structures

Abstract We present the results of the investigations of high conducting area and superconductivity at the interfaces between ferroelectric oxide and insulating oxide in heterostructures, isostructural to BaTiO3/LaMnO3 and BaTiO3/La2CuO4. The numerical simulations of these heterostructures have been performed. The temperature dependence of the measured electrical resistance of Ba0.8Sr0.2TiO3/LaMnO3

Abstract The stochastic models of temperature diffusing of the phase transition are presented, taking into account the structural disorder of the material by introducing a random function, i.e., the temperature of the phase transition as a function of coordinates. The structural disorders in the plane and across the thickness of the ferroelectric film are considered. The temperature of the phase transition

Abstract Ceramic samples of the ternary 0.5Y0.1Zr0.9O2 − 0.5(0.6SrTiO3 − 0.4BiScO3) system consisting of the individual Y0.1Zr0.9O2 and 0.6SrTiO3 − 0.4BiScO3 subsystems were synthesized using solid-state processing techniques. Coexistence of the tetragonal P42/nmc phase characteristic of the 5Y0.1Zr0.9O2 subsystem and the cubic Pm3¯m and tetragonal P4mm phases characteristic of the 0.6SrTiO3 − 0.4BiScO3

Abstract In this work we present the results of study of the influence of Eu doping on temperature behavior of the dielectric response and conductivity in the frequency range of 10 Hz–1 MHz and the temperature range of 300–750 K, and low temperature (5–400 K) specific heat of the Na1/2Bi1/2TiO3 (NBT) single crystals. It is shown that volume conductivity of NBT is thermally activated with activation

Abstract Photoluminescence and optical second harmonic generation in Er-doped 0.4Na0.5Bi0.5TiO3-(0.6-x)SrTiO3-xPbTiO3 solid solutions is studied. Earlier, it was shown that upon increasing of PbTiO3 concentration transfer from relaxor to ferroelectric state takes place in these compositions. Here, role of PbTiO3 and Er concentration on stability of the ferroelectric state is evaluated, taking into

Abstract Conversion of waste heat into usable electricity is a strategic technology for saving natural resources and an important option for powering autonomous devices. Current developments in micro- and nanotechnology open new horizons and require revisiting the process of energy conversion with a focus on low-dimensional micro- and nano-scale generators. An important advantage of the low-dimensional

Abstract A comparative study on a set of electrophysical parameters of novel piezo-active composites is carried out. These composites are based on ferroelectric ZTS-36 ceramic of the PZT type. The second (piezo-passive) component is either clay or corundum ceramic, and its volume fraction mc is varied from 0.01 to 0.10 (clay) or from 0.01 to 0.12 (corundum). The studied composites are characterised

Abstract The article reports results of the comparative study on the performance of lead-free 1–3-type composites based on domain-engineered lead-free ferroelectric single crystals. Of interest are the 1–3–0 ferroelectric single crystal/porous polymer and 1–0–3 ferroelectric single crystal/piezoelectric single crystal/polymer composites with heterogeneous matrices. In the 1–3–0 composite this matrix

Abstract Water’s properties are exceptional at low temperatures. Dielectric constant demonstrates ferroelectric-like behavior. We treat an idea to interpret the fundamental feature of water, 240 K singularity, through the Maxwell speed distribution of freely moving water molecules. We use the ion-molecular model recently proposed by us, in which water molecules make the translation-oscillator movement

Abstract The dependence of the microstructure and domain structure of sodium niobate ceramics on the production conditions (synthesis temperature of the initial composition and sintering temperature of the samples) was studied by scanning electron microscopy (SEM) and piezoelectric force microscopy (PFM). It is found that the samples whose material was obtained without re-synthesis have a larger grain

Abstract It is shown that basing on the symmetry of a crystal, it is possible to predict direction and the geometry of the experiment when the photovoltaic current is different from zero. From the obtained results it follows, that the energy of the charge carriers responsible for the photovoltaic current is much higher than the thermal contribution to the energy of these carriers and, therefore, the

Abstract Temperature dependences of internal friction Q−1 and elastic modulus E of the VDF60Tr40 copolymer were studied in the temperature range of 20–100 °C at a frequencies f ≈ 3–17 Hz. A distinct softening of the modulus E was found near the Curie temperature. In the vicinity of 60 °C, a wide maximum of Q−1 is revealed, which is a superposition of two Q−1 peaks. The “low-temperature” peak of internal

Abstract Multiferroic Pb(Fe0.5Nb0.5)1-xCexO3 (x = 0.025, 0.05, 0.075, 0.10) ceramic compositions were prepared by solid state synthesis and usual sintering. XRD studies have shown a formation of the perovskite structure in all the compositions studied. However a small amount of pyrochlore phase was detected in Ce-doped compositions with x ≥ 0.075. Scanning electron microscopy studies and elemental

Abstract The influence of a static magnetic field on the permittivity ε of pure TGS crystals has been studied. There is no of the magnetic effect when the vectors B and PS are collinear, it exists when B and PS are mutually orthogonal and it is greater when B is oriented along a-axis. After the magnetic field is turned off, the values of ε first increase up to the maximum observed of about 30–40 h

Abstract Influence of thermal treatment in H2 atmosphere on magnetic and dielectric properties of nanocrystalline BaTiO3 samples was studied. It was found that increase of the concentration of oxygen vacancies during prolonged annealing in hydrogen leads to a noticeable increase in the diamagnetic response and a decrease in the magnetization and dielectric permittivity. Observed changes of magnetic

Abstract In this paper, (Fe,Cr)7C3/Fe surface gradient composite was produced by solid reaction combining in situ reaction, using pure chromium plate and HT300. The chromium carbide particles were synthesized in the HT300 by in situ reaction between the chromium atoms of the chromium plate and the carbon atoms of the HT300. The phase constituent, microstructure, microhardness and modulus of the composite

Abstract Given the differing structure of transmissions for pure electric vehicles from the conventional ones, how to enhance the transmission performance is the key to improving their dynamic property and economical efficiency. In this work, a two-speed planetary transmission for a self-designed 10–12 m bus is studied. A simulation model of the transmission is created according to the gear meshing

Abstract The method of oxalate co-precipitation assisted with microwave is used for the synthesis of pure barium titanate (BT) particle with a diameter of 30–50 nm by choosing tetrabutyl titanate Ti(OC4H9)4 (98.0%), barium nitrate Ba(NO3)2 (99.5%), oxalate H2C2O4 (99.5% purity) and nitric acid HNO3 (65 ∼ 68%) as starting materials. Lanthanum oxide is doped in barium titanate powders to prepare ceramics

Abstract The need to improve formability and weight reduction in the automotive industry has greatly contributed to the development of transformation-induced plasticity (TRIP) steel. The stress–strain curves of TRIP steels can be generally controlled by adjusting composition, temperature and volume fractions. Based on Hollomon equation and mixture law, microstructure-based constitutive model of Si-Mn

Abstract The use of PVC ecological-wood in composite wall is expected to provide the requirements of green and sustainable development. So bending performance experiment and tensile property test were done for the materials that makes up the PVC ecological-wood board. The stress–strain relations model, tensile properties, bending resistance characteristics of PVC ecological-wood board were proposed

Abstract In this paper, the 30 vol% SiCp/6061Al composites were prepared by vacuum hot pressing sintering. The effect of SiC particle size on the microstructure mechanical properties and wear behaviour of SiCp/6061Al composites was studied. From the results, it is shown that the SiC particle distribution increases firstly and then decreases with the increase of the particle sizes, the relative density

Abstract With sugarcane bagasse as the carrier and iron chloride hexahydrate (FeCl3·6H2O) as the iron source, Fe3O4@C materials were prepared in this study. Then the adsorption properties of the prepared adsorbents were characterized by XRD, SEM and VSM analysis. The effects of adsorption time, initial pH value and initial methylene blue concentration on methylene blue adsorption performance were studied

Abstract In this study, a novel hydroxyapatite (HA)/polyurethane (PU) composite porous 3D scaffold was developed by in situ polymerization. Aliphatic hexamethylene diisocyanate (HDI) as a nontoxic and safe agent was adopted to produce the rigid segment in PU polymerization. HA powder was compounded in a PU polymer matrix during the polymeric process. The macrostructure and morphology as well as mechanical