Abstract The potassium dihydrogen phosphate (KDP) is a popular nonlinear optical material. Optically good quality LiCl doped KDP crystals have been grown by slow solvent evaporation method at room temperature. The structural study of grown crystals reveled single phasic nature of grown crystals with slight variation in unit cell parameters. I had done the Rietveld refinement to study the influence

Abstract LiNiPO4 has been the focus of research in developing environmentally friendly, low cost and high performance cathode materials for lithium-ion batteries. The aim of this work is to synthesize LiNi0.5Co0.45Zn0.05PO4 cathode material using solid-state reaction method at 850 °C for 20 hours and all the parameters compared with LiNiPO4. The X-ray diffraction (XRD) analysis confirmed that LiNi0

Abstract The temperature dependence of the piezoelectric resonance frequency is analyzed by the power-law formula in the vicinity of the critical temperature of the incommensurate (INC) phase in quartz using the experimental data from the literature. By considering the piezoelectric resonance frequency as an order parameter of the INC phase, correlation between the piezoelectric resonance frequency

Abstract Anisometric Na2Nb8O21 particles were synthesized by a molten salt synthesis (MSS). The effects of salt content on the crystal structure and morphologies of the product powder were analyzed. The results show that the addition of excess NaCl effectively promoted the growth of product particles. The Na2Nb8O21 ceramics were prepared using the obtained particles as raw materials. It was found that

Abstract Single-phase Sodium (Na), Samarium (Sm) substituted Strontium Bismuth Titanate (SNSBTi I-V) ceramics were synthesized by solid-state double sintering approach via high energy planetary ball mill for 20 hours grinding. X-ray diffraction (XRD) study confirms the primary structure and orthorhombic distortion of crystal. Scanning electron microscopy (SEM) shows the grain orientation and densified

Abstract Epitaxial SrTiO 3 thin films were grown by molecular beam epitaxy (MBE) using an oxygen plasma source. SrO and TiO2 layers were alternately deposited on 0.5 wt% (001) Nb doped SrTiO3 substrates whose surface were terminated with TiO2. A two-dimensional (2-D) layer-by-layer growth mode was confirmed by the reflection high energy electron diffraction (RHEED) oscillation during the growth and

Abstract Herein, we report on the temperature-dependent dielectric behavior of two ferroelectric liquid crystal (FLC) compounds belonging to a homologous series in the frequency range of 10 Hz–10 MHz. Precisely, the FLCs investigated in the present study are the three-ring, optically active calamitic LCs namely, (R)-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-(nonyl-oxy)benzoate and (R)-4-(

Abstract We study electrical behaviors of a thin piezoelectric semiconductor film under edge stress or interior local stress. The theory of piezoelectricity with coupling to the diffusion-drift theory of semiconductors is used. It is reduced to a two-dimensional theory for the extension of thin piezoelectric semiconductor films. The two-dimensional equations are solved using COMSOL, a numerical analysis

Abstract Effect of glass addition (0.5, 1, 1.5, 2 wt%) on the dielectric, ferroelectric and energy storage properties of barium titanate (BT) ceramic was studied. Phase formation was confirmed by XRD. Lattice parameters were determined by Rietveld refinement and crystallite size, microstrain was determined by W-H plots. Relative density was found to be increasing with addition of glass. Glass addition

Abstract PbZr x Ti 1-x O3 (PZT) films were fabricated on FTO substrates by using precursor solutions containing polyvinylpyrrolidone additive and spinning-coating/annealing process. The correlation of the formation, ferroelectric, dielectric and optical reflection features of the layered PZT films with Zr/Ti atomic ration had been studied. It was found that each PZT film was fully crystallized and

Abstract Nanocomposites and nano ceramics are very important materials due to its wide applications in the field of energy supply and storage, communications, refractory and electrical devices etc. The optical properties, nature of dielectric relaxation mechanism, loss factor etc are very important in deciding their use. Magnesium oxide is basically an insulator material and when combined with a transparent

Abstract By using a solid-state reaction method, new ceramics compounds Co2NdNbO6 were synthesized. These compounds consisted of two phases and had a stable structure. The relation of dielectric constant (ε r), relative density, grain size, and polarizability were discussed. The quality factor (Q f) values were strongly affected by the density, and a sudden decrease of the density can lead to the decline

Abstract The ceramic oxide K2Pb2Gd2W2Ti4Ta4O30 was synthesized by solid solution route. The formation of compound was checked by using XRD and SEM study, suggesting that material is single phase and dense. Temperature variation of dielectric parameters reveals ferroelectric to paraelectric phase transition. Polarization study confirms the presence of ferroelectricity. The transport property of the

Abstract Solid state technique is employed to prepare La doped BNT-BFO perovskite ceramics. The sample has cubic structure and lattice strain = 0.00127 calculated by Williamson–Hall method. The frequency bands corresponding to Bi-O, Ti-O, O-, NaO, LaO and FeO stretching confirm that Fe+2, La+2 ions completely incorporate the Ti+4 ions in the B site of the perovskite. The SEM micrograph shows distinct

Abstract Based on density functional theory, this paper has investigated the stability and electronic structure of Ni–Fe alloy within three different space groups using the first-principles method, and calculated the binding energy, differential charge density and electronic density of states of the optimized space groups. The results show that the order of the three space groups’ stability is Pm-3m

Abstract Copper ferrite/copper oxide (CuFe2O4/CuO) nanocomposites contents were prepared by using co-precipitation and sol-gel methods. The alternating current impedance and permittivity parameters of the samples were obtained by an impedance analyzer between 10 Hz and 40 MHz. The temperature dependences of magnetization were measured in zero-field-cooled (ZFC) and field-cooled (FC) modes and hysteresis

Abstract The applicability of Landau-Devonshire phenomenological model with an extended kinetic energy term on the response of the hysteresis, including remanent polarization, coercive field, and loop area, to the wide-span frequency of time-varying external field is investigated for ferroelectric film. A suitable and typical physics parameter set is found to permit all three variables as a function

Abstract The refraction characteristics of 50 nm thickness of PbTiO3 (PTO) film pumped by various optical power in terahertz (THz) range is measured by THz time domain spectrum. Experiments indicated that the refraction index was 65–110 in the range of 0.2–1 THz and the tunability reached 36.95% when applied 400 mW optical field. The theoretical analysis revealed that the photorefractive and the photothermal

Abstract In this study, pellet samples of Na1-xKxNbO3 (NKN) (0.160 ≤ x ≤ 0.200) were prepared using the solid- state reaction method with double sintering. Electric conductivity (σ), loss tangent (tan δ), and dielectric constant (ε) were observed for all the prepared compositions from room temperature (RT) to 480 oC, at 10, 100, and 1000 KHz. For the prepared compositions (0.160 ≤ x ≤0.200), XRD patterns

Abstract In the present work, GdMnO3 samples were synthesized by acetate precursor based modified sol–gel method with different sintering temperatures. XRD was performed to understand the structural properties of the samples which imply that samples possess single phasic nature with orthorhombic structure. UV–vis absorption spectrum was analyzed using Tauc’s relation which gives a direct band gap of

Abstract The structure stability, mechanical properties and electronic structures of B2-FeAl intermetallics and the influence of La/Ce doping were investigated by first-principles density functional theory calculations. Several models were established. The total energies, cohesive energies, lattice constants, elastic constants, electronic density of states of Fe8Al8 and Fe8Al7X (X = La, Ce) were analyzed

Abstract It is demonstrated that the dielectric properties of ceramics in the 0.6PMN–0.4PZN system have been studied as a function of different synthesis method at various temperatures. A detail and systematic study of phase, grain size and dielectric properties has been carried out by using X-ray diffraction, SEM techniques and dielectric measurement. Our analysis revealed that the optimum results

Abstract It is known that in multicomponent piezoceramics with a certain ratio of the components of the solid solution and modifying impurities, the phase transition from the ferroelectric phase to the paraelectric one occurs in several stages. The temperature interval of such structural and polarization changes, can reach hundreds of degrees. The aim of the present article is to study an effect of

Abstract In this work, complex studies of the elastic dispersion and losses in porous piezoceramics based on solid solutions of the PZT system were carried out. Full set of complex constants of porous ceramics with different porosity and their frequency dependences were measured using the piezoelectric resonance analysis method.The microstructural and physical mechanisms of elastic losses and dispersion

Abstract This work developed a piezoelectric micro-beam based energy harvester laminated with light activated shape memory polymer (LASMP). With noncontact mechanism and dynamic Young’s modulus of LASMP, natural frequency of the energy harvester can be tuned during light exposure. Based on modified couple stress theory, the governing equation of the size-dependent micro-beam is derived via Hamilton’s

Abstract Magnetoelectric Zn0.5Co0.5Fe2O4 – PbZr0.58Ti0.42O3 nanocomposites are synthesized considering chemical reaction process at low temperature and solid-state reaction technique. Structural characterization is performed by X-ray diffraction analysis, which shows two types of nanometric grains coexisting simultaneously. The materials surface morphology displays that the fabrication method is quite

Abstract Three step sintering method has been introduced in KNN-based lead free piezoceramics. The phase structure of the ceramics transform from rhombohedral phase to the coexistence of rhombohedral phase and tetragonal phase, and phase transition temperature shifts to −10 °C by three step sintering. Excellent piezoelectric properties have been obtained, d33 = 405pC/N at room temperature, the d33

Abstract A circular piezoelectric pavement energy acquisition device for road was designed by using the stack mechanism on a piezoelectric ceramic unit. Two different orientations of piezoelectric transducers were compared according to the pavement construction mode, and their conversion performance was evaluated based on the traffic load model. The performance of the transducer was analysed from two

Abstract Bi0.8Ho0.2Fe0.95Ti0.05O3 (BHFTO) nanoceramics with a grain size below 100 nm were prepared by spark plasma sintering (SPS) method, and their sintering process, microstructure, dielectric, and magnetic properties were studied. The analysis of microstructure suggests the formation of orthorhombic structure (space group, Pnma) in BHFTO nanoceramics with a homogeneous distribution in grain sizes

Abstract We have reported the impact of work function variability (WFV) of TiN metal gate on the variation in electrical parameters for negative capacitance FinFET (NC-FinFET) through TCAD simulator. It is found that as the thickness of ferroelectric layer (tFE) increases, the fluctuation in electrical parameters like threshold voltage (σVT), subthreshold swing (σSS), on current (σIon), and off current

Abstract We performed the first-principles calculations about the electronic and magnetic properties of hydrogen saturated zigzag silicene nanoribbon (HZSiNR) doped with a B atoms chain. The calculated results of formation energies indicate that the doped configurations possess thermodynamic stability. For HZSiNR doped with B atoms chain, a significant transition from semiconducting character to metallic

Abstract BaTiO3 is a ferroelectric sensor in the piezoelectric transforming conditions. In this study, we focused on the electron transport characteristics in the interface between the Pt and the BaTiO3, which enhanced the conductive properties of BaTiO3. This approach will be more helpful to transfer the piezoelectric signal and may offer some new suggestion of the conductive behavior of the BaTiO3

Abstract Oxides of strontium, bismuth, calcium, and titanium were aggregated by high energy mechanical milling. XRD and SEM analyses revealed characteristic peaks for materials of a similar crystal structure. The temperature response of dielectric constant has been recorded at various frequencies. An increase of dielectric constant until the Curie temperature has a huge impact on the dielectric constant

Abstract Dielectric spectroscopic measurements of five homologous series of orthoconic antiferroelectric liquid crystalline (OAFLC) esters (S)-MHPOBC ((S)-4-(1-methylheptyloxy) carbonyl phenyl 4’-octyloxy-4-biphenylcarboxylate) has been investigated. The investigated compound contains SmC*, SmCA* and SmA phase with SmCA* phase at a broad temperature range. Parameters such as absorption curve, dispersion

Abstract A new method for prototype of a three dimensional (3 D) microfluidic device on piezoelectric substrate was presented. Wires were stick by colloidal starch, and dried in a thermotank for three dimensional channels mold. The mold was slightly placed in a groove with poly(dimethylsiloxane). After having been solidified, these wires were drawn off to form 3 D microchannels. Surface acoustic wave

Abstract Li doped sodium-potassium niobate (Na0.5K0.5)1-yLiyNbO3 ceramic pellets, with y = 0 to 7 (mole) %, were prepared by solid state reaction method with double sintering. With varying lithium content (y), dielectric properties, and X-ray diffraction (XRD) peaks shifting pattern exhibit strong compositional dependence. Among the prepared Composition, a break in XRD peaks shifting tendency, and

Abstract By introducing nonlocal elastic theory and Kirchhoff plate theory to plane wave expansion (PWE) method, the band structure of a nonlocal piezoelectric phononic crystal (PC) nanoplate is calculated. A complete band gap with magnitude order gigahertz (GHz) is opened. In order to investigate the characteristics of such a band gap in detail, the corresponding influence rules of thermo-electro-mechanical

Abstract The focus of this study is on the control of layers between grains by applying graph theory. We performed modification of BaTiO3 nanoparticles with Y2O3. The results of capacitance change on submicron level are the part of the measured values on the bulk samples. The original idea is to develop the new approach to use graph theory for networking of electronic parameters between the neighboring

Abstract A novel lead-free Ba(1-x)(La,Na)xTiO3 (BLNT), (0 ≤ x ≤ 0.08) ferroelectric ceramic with enhanced energy storage density was fabricated by the conventional solid-state method. With an increase in La3+/Na+ content, the energy storage density, efficiency and power density were increased. The samples with (x = 0.08) show recoverable energy storage of (1.07 J/cm3), 3 times higher than that of pure

Abstract Barium titanate (BaTiO3) is a ferroelectric and piezoelectric material with excellent components. Barium titanate film success fully made with various concentration of CeO2 0%, 2%, 4%, and 6% through Chemical Solution Deposition (CSD) method in annealed process at 550 °C for 23.5 hours and the spin coating technique with a speed of 8000 rpm. The results of the crystal properties test showed

Abstract In this paper, the polarization curve and corrosion amount of aluminum alloy 1050 in 30 mass% nitric acid solution were measured as the corrosion potential under natural corrosion. it was found that the surface corrosion of aluminum alloy was uniformed and the corrosion rate calculated according to the weight loss-time curve was 0.25 mA·cm−2 by observing the corrosion morphology. The polarization

Abstract In this paper, the effect of different masses of the inertia-type piezoelectric actuator is investigated within the general operating frequency range of most of the power tools. The inertia piezoelectric actuator was applied to the active suspended handle system to reduce the shaker-excited vibration for both frequency independent and dependent excitations. For the condition of frequency independent

Abstract The purpose of this study was to investigate the mechanism of adsorption reaction between heterocyclic organic compounds with different number of ring atoms and different atoms replacing carbon atoms and carbon nanotubes with different surface functional groups. Based on the current situation of research on adsorption of carbon nanomaterials adsorbing organic pollutants, the existing problems

Abstract In this paper, waste concrete of different strength grades is used as a substitute for calcareous and siliceous materials. The effects of waste concrete with different strength grades, various raw material compositions, distinct calcination temperatures, burnability of cement clinker, lithofacies characteristics and microscopic morphology hydration products are studied systematically. The

(2020). Editorial. Ferroelectrics: Vol. 569, No. 1, pp. iii-iv.

Abstract In this paper, the development in the field of ferroelectrics is reviewed by summarizing the topics in the field as presented at the International and European conferences on Ferroelectrics. While from the very beginning in 1966 until now fundamentals in ferroelectrics always played a significant role, it is shown that the topics considerably broadened over the years and are nowadays barely

Abstract Giant permittivity (GP) materials are of interest as possible capacitors for energy storage. Ferroelectric and related homogeneous materials suffer from strongly temperature dependent dielectric properties. Therefore, within the last two decades, the interest has been focused to dielectric studies of various inhomogeneous GP materials, where the essential role was shown to be due to weak but

Abstract The bottleneck of the piezoelectric devices in miniaturization is the heat generation owing to the losses. There are three losses in a piezoelectric material; dielectric, elastic and piezoelectric losses. The development of high-power density piezoelectrics is directly relevant to the clarification of the loss mechanisms in such materials. This article describes the characterization methodologies

Abstract A physical system experiences a phase transition when it goes from an ordered configuration (low temperature) to a disordered state (higher temperature). An order parameter is related to the corresponding conjugated field, that drives the system behavior. Some properties that are temperature dependent change dramatically at a so called critical temperature, indicating the point at wich the

Abstract The review is focused on the phenomenological description of the elastic defects influence on the electrophysical properties of nanosized ferroics. Using the Landau-Ginzburg-Devonshire phenomenological approach we consider the contribution of the elastic defects (e.g. neutral oxygen vacancies) on the phase transitions temperatures, phase diagrams, piezo-resistive, dielectric and polar properties

Abstract Mean-field models for behavior of ferroelectric (FE) crystals like KH2PO4 (KDP) succeed well in explaining behavior in the paraelectric (PE) phase in which the various phosphate groups HiPO4 (i = 1, 2, or 3) groups are distributed quite randomly. However, they underestimate the spontaneous polarization Ps in the FE phase, in which these groups are distributed quite nonrandomly. Instead, within

Abstract The motion of domain walls and phase fronts in ferroelectric and ferroelastic materials displays discrete, impulsive jumps, i.e. jerks, as indicators of avalanches on a broad range of scales. Several experimental techniques used to characterise these avalanches show that they are power law distributed and share some statistical similarities with the avalanches observed during the compression

Abstract In the present article, a brief introduction about multiferroic composites is provided. Recent advancement in the field of multiferroic composites is discussed by classifying these in bulk composites, thick & thin films and other heterostructures. Research findings of some renowned work are summarized, considering new emerging materials, new methods of synthesis and latest characterization

Abstract Ferroelectric materials with high Curie temperatures, TC, and tuning of the TC over a large temperature range are very important for the basic sciences and engineering. This paper reviews the various types of high-temperature ferroelectrics with perovskite, bismuth layered, tungsten bronze, and perovskite slab structures, especially Sr2Nb2O7 with TC = 1342 °C and its family. The lattice instability

Abstract The present study investigates energy storage and electrocaloric properties of lead-free barium calcium titanate (BCT) ceramics with compositions B0.80Ca0.20Ti1–3x/4FexO3 (x = 0.000, 0.005, 0.010, 0.015, and 0.020) prepared by solid-state reaction route. Variation of polarization with the temperature at various applied fields has been used to study the electrocaloric behavior of the prepared

Abstract The unconventional Si-compatible ferroelectricity in hafnia-based systems, which becomes robust only at nanoscopic sizes, has attracted a lot of interest. While a metastable polar orthorhombic (o-) phase (Pca21) is widely regarded as the responsible phase for ferroelectricity, a higher energy polar rhombohedral (r-) phase is recently reported on epitaxial HfZrO4 (HZO) films grown on (001)

Abstract The polarization switching kinetics of ferroelectric crystals and the transition from domain switching to homogeneous in nanoscale films are considered. Homogeneous (non-domain) switching according to the Ginzburg–Landau theory is possible only in two-dimensional ferroelectrics. The analysis of the results of calculations from the first principles and experiments is given.

Abstract A simplified two length-scale model is applied in direct flexoelectricity for two-dimensional problems. Numerical experiments are performed to obtain the two unknown flexoelectric parameters that appear in gradient theory in elasticity. They are determined by fitting the results from an atomistic model with an analytical solution for a simple problem employing gradient theory, namely, a square

Abstract The manuscript discusses a theoretical model that predicts a giant magnetoelectric (ME) coupling in laminates of ferrite and piezoelectric bimorph at the coincidence of electromechanical resonance for the electrical subsystem and ferromagnetic resonance for the ferrite. In such structures, the ME interaction is a result of mechanical strain. Using the piezoelectric bimorph gives rise to the

Abstract Influence of cation substitutions in (K0.5Na0.5)NbO3–Ba(Li2/5W3/5)O3 ceramics on structure parameters, microstructure, dielectric, ferroelectric and local piezoelectric properties have been studied. Depending on solid solutions compositions, changes in structure parameters and effective d33 piezoelectric coefficient and other properties were observed.