A5017000466- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Photorefractive and Nonlinear Optics
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Solid-state spectroscopy and crystallography
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Glass properties and applications
- Laser Material Processing Techniques
- Optical and Acousto-Optic Technologies
- Photonic and Optical Devices
- Electronic and Structural Properties of Oxides
- Advanced Fiber Laser Technologies
- Semiconductor materials and interfaces
- Ion-surface interactions and analysis
- Photonic Crystals and Applications
- Advanced Sensor and Energy Harvesting Materials
- Metallic Glasses and Amorphous Alloys
- Magnetic properties of thin films
- Material Science and Thermodynamics
- Solid State Laser Technologies
- Dielectric materials and actuators
- Dielectric properties of ceramics
- Advanced Thermoelectric Materials and Devices
Ural Federal University
2016-2025
Pennsylvania State University
2017
Institute of Natural Science
2015
Ferro (United States)
2015
Abstract Electromechanical properties such as d 33 and strain are significantly enhanced at morphotropic phase boundaries (MPBs) between two or more different crystal structures. Many actuators, sensors MEMS devices therefore systems with MPBs, usually polar phases in lead (Pb)-based ferroelectric ceramics. In the search for Pb-free alternatives, MPBs non-polar have recently been theorized having great promise. While an MPB was identified rare-earth (RE) modified bismuth ferrite (BFO) thin...
The influence of domain walls on the macroscopic properties ferroelectric materials is a well known phenomenon. Commonly, such “extrinsic” contributions to dielectric permittivity are discussed in terms wall displacements under external electric field. In this work, we report possible contribution charged low frequency (10–106 Hz) K1-xNaxNbO3 ceramics. It shown that effective response increases with increasing density. effect has been attributed Maxwell-Wagner-Sillars relaxation. obtained...
Currently, ferroelectric materials with designed domain structures are considered as a perspective material for new generation of photonic, data storage, and processing devices. Application external electric field is the most convenient way structure formation. Lots papers devoted to investigation kinetics on polar surface crystals while forward growth remains one mysterious stages due lack experimental methods allowing study it. Here, we performed tip-induced polarization reversal X-...
Herein, the results of studying reflection stripe domains growing during polarization reversal in congruent lithium niobate single crystals modified by soft proton exchange are presented. The situ optical imaging reveals with growth directions along three equivalent Y crystallographic axes. When domain approaches standing one, its direction changes 120° to another axis. A strong difference on opposite polar surfaces is revealed: at Z + surface it occurs lower distances through two successive...
The field-induced evolution of as-grown domain structure was studied in an annealed calcium orthovanadate (CVO) crystal under application the electric field pulses at elevated temperature using various imaging methods. It shown that with charged walls (CDWs) bulk action represented sideways growth large domains and appearance unstable stable surface. caused by lowest charge density edges. screening retardation facilitated ledges CDWs, which grew external became after touching polar rare...
Forward domain growth representing one of the main stages switching is studied for isolated domains and arrays appearing as a result tip-induced on non-polar cuts lithium niobate crystals. Formation wedge-like with high aspect ratio charged walls observed. The in area negligible external field considered terms kinetic approach based analogy crystal growth. wall motion by step generation propagation kinks discussed. It proposed that contains inputs produced biased scanning probe microscope...
BiFeO3 (BFO) is a classical multiferroic material with both ferroelectric and magnetic ordering at room temperature. Doping of this rare-earth oxides was found to be an efficient way enhance the otherwise low piezoelectric response unmodified BFO ceramics. In work, we studied two types bulk Sm-modified ceramics compositions close morphotropic phase boundary (MPB) prepared by different solid-state processing methods. samples, coexistence polar R3c antipolar Pbam phases detected conventional...
Electrochemical strain microscopy (ESM) is a scanning probe (SPM) method in which the local electrodiffusion probed via application of AC voltage to SPM tip and registration resulting electrochemical strain. Here, we implemented ESM measure bulk LiMn2O4 cathodes commercial Li-battery different states charge investigate distribution Li-ion mobility concentration. Ramped imaging spectroscopy were used find most reliable regime measurements allowing separating diminishing contributions ESM....
The understanding of self-organization processes at the micro- and nanoscale is fundamental interest important to meet great challenges in further miniaturization electronic devices nanoscale. Here, we report self-organized quasi-regular nanodomain structure formation on nonpolar cut a ferroelectric lithium niobate single crystal. These structures were formed along trajectory grounded scanning probe microscope tip approaching or moving away from freshly switched region. Detailed analysis...
The creation of the periodical domain patterns with a submicron period in lithium niobate on insulator (LNOI) wafers is key problem for nonlinear-optical applications, including second harmonic generation, backscattering optical parametric oscillator, etc. We have experimentally studied formation and evolution during local polarization reversal Z+ LNOI metal bottom electrode. It has been shown that growth occurs by spikes at charged wall (CDW). complicated shape isolated domains jagged CDW...
Ferroelectric nanodomains were formed in bulk lithium niobate single crystals near nanostructured microtracks laser-inscribed by 1030-nm 0.3-ps ultrashort laser pulses at variable pulse energies sub- and weakly filamentary nanopatterning regimes. The related characterized optical, scanning probe confocal second-harmonic generation microscopy methods. nanoscale material sub-structure the was visualized sample cross-sections atomic force (AFM), appearing birefringent polarimetric microscope...
Lead-free piezoelectrics are becoming increasingly important in view of environmental problems currently used lead-based perovskites such as lead zirconate titanate (PZT). One the recent candidates for PZT replacement, solid solutions BaZr0.2Ti0.8O3 and Ba0.7Ca0.3TiO3, investigated this work by piezoresponse force microscopy. Coexistence tetragonal rhombohedral phases material is observed, which probably gives rise to easy polarization switching due multiple domain states. The period...
Monitoring the charged defect concentration at nanoscale is of critical importance for both fundamental science and applications ferroelectrics. However, up-to-date, high-resolution study methods investigation structural defects, such as transmission electron microscopy, X-ray tomography, etc., are expensive demand complicated sample preparation. With an example lanthanum-doped bismuth ferrite ceramics, a novel method proposed based on switching spectroscopy piezoresponse force microscopy...
The structural state and crystal structure of Lu(1−x)ScxFeO3 (0 ≤ x 1) compounds prepared by a chemical route based on modified sol–gel method were investigated using X-ray diffraction, Raman spectroscopy, as well scanning electron microscopy. It was observed that doping with Sc ions led to phase transition from the orthorhombic hexagonal via wide two-phase concentration region 0.1 < 0.45. An increase in scandium content above 80 mole% stabilization non-perovskite bixbyite specific for...
The systematic imaging of the damaged tracks and domain patterns created in MgOLN plates by one-step fs-laser irradiation at different depths was carried out. It is shown that domains bulk have a spindle-like shape start to grow Z− direction from track ends. changes one with charged walls hexagonal prism neutral after reaches polar surface. length located increases linearly pulse energy. surface typical for crystals lithium niobate family. obtained effects been considered terms kinetic...
We have studied experimentally the interaction of isolated needle-like domains created in an array via local switching using a biased scanning probe microscope (SPM) tip and visualized piezoelectric force microscopy (PFM) at non-polar cuts MgO-doped lithium niobate (MgOLN) crystals. It has been found that domain leads to intermittent quasiperiodic chaotic behavior length manner similar polar cuts, but with greater spacing between points bias application voltage amplitudes. also polarization...