A5015997435- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Acoustic Wave Resonator Technologies
- Dielectric materials and actuators
- Dielectric properties of ceramics
- Electronic and Structural Properties of Oxides
- Electrical and Thermal Properties of Materials
- Advanced Sensor and Energy Harvesting Materials
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and devices
- ZnO doping and properties
- Advanced ceramic materials synthesis
- Photorefractive and Nonlinear Optics
- Iron oxide chemistry and applications
- Conducting polymers and applications
- Electrophoretic Deposition in Materials Science
- Copper-based nanomaterials and applications
- Adhesion, Friction, and Surface Interactions
- Solid-state spectroscopy and crystallography
- Liquid Crystal Research Advancements
- Magnetic Properties and Synthesis of Ferrites
- Superconductivity in MgB2 and Alloys
- Nanomaterials and Printing Technologies
- Aerogels and thermal insulation
Jožef Stefan Institute
2015-2024
Jožef Stefan International Postgraduate School
2012-2024
Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2024
Centre of Excellence NAMASTE
2012-2014
Instituto de Ciencia de Materiales de Madrid
2012
University of Ljubljana
2005
The electrocaloric effect (ECE), i.e., the conversion of electric energy into heat, is great importance for application in new generation cooling or heating devices that would be friendlier to environment. Here, utilizing direct measurements ECE change temperature ΔT via a high resolution calorimeter, we study as function magnitude electric-field step E vicinity critical point several bulk relaxor ferroelectric ceramic systems. Relatively large ∼2 3 K were obtained at modest fields 90 kV/cm,...
The electrocaloric effect (ECE), i.e., the conversion of electric into thermal energy has recently become great importance for development a new generation cooling technologies. Here, we explore utilization [Pb(Mg1∕3Nb2∕3)O3]0.9[PbTiO3]0.1 (PMN-10PT) relaxor ceramics as active elements heat regenerator in an ECE device. We show that PMN-10PT ceramic exhibits relatively large change temperature ΔTEC > 1 K at room temperature. experimental testing device demonstrates efficient...
The interfaces in complex oxides present unique properties exploitable nanoscale devices. Recent studies on ferroelectric BiFeO 3 , BaTiO and Pb(Zr,Ti)O have revealed an unusually high electric conductivity of the domain walls (DWs), adding another degree freedom for controlling local these materials. While most investigations are focused thin films applications, many practical devices, including piezoelectric sensors, actuators, transducers, rely macroscopic bulk polycrystalline materials...
Abstract magnified image The energy band alignment at interfaces between different materials is a key factor, which determines the function of electronic devices. While conventional semiconductors quite well understood, systematic experimental studies on oxides are still missing. This work presents an extensive study intrinsic wide range functional using photoelectron spectroscopy with in‐situ sample preparation. studied have particular technological importance in diverse fields as solar...
Abstract Electro-mechanical interactions between charged point defects and domain walls play a key role in the functional properties of bulk thin-film ferroelectrics. While for perovskites macroscopic implications ordering degree on domain-wall pinning have been reported, atomistic details these mechanisms remain unclear. Here, based atomic nanoscale analyses, we propose mechanism associated with conductive BiFeO 3 , whose origin lies dynamic coupling p-type gathered regions displacements...
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 dielectric, ferroelectric, piezoelectric, and electrostrictive properties of K0.5Na0.5NbO3 single crystals (KNN s.c.) prepared by solid-state crystal growth are reported. dielectric constant (ε), losses (tan δ), remanent polarization (Pr), coercive field (Ec) for KNN s.c. in the [13¯1] direction at room temperature 1015, 1%, 17 μC/cm2, 24 kV/cm, respectively. influence 180° domains to linear piezoelectric response quadratic is discussed. coefficient d33 M33 measured using atomic force...
Abstract The giant electrocaloric (EC) effect is of great importance for application in cooling or heating devices new generation, which would be friendlier environment. Recent predictions the existence EC polymeric and inorganic ferroelectric relaxors are based solely on indirect measurements electric polarization not a direct measurement itself. Here method analysis various soft solid materials form thick thin films presented. field dependence shown PbMg1/3Nb2/3O3 (PMN) ceramics...
Abstract Lead‐based relaxor ferroelectrics are characterized by outstanding piezoelectric and dielectric properties, making them useful in a wide range of applications. Despite the numerous models proposed to describe relation between their nanoscale polar structure large multiple contributions these properties not yet revealed. Here, combining atomistic mesoscopic‐scale structural analyses with macroscopic measurements across (100– x )Pb(Mg 1/3 Nb 2/3 )O 3 – PbTiO (PMN– PT) phase diagram,...
The design of lead-free ceramics for piezoelectric energy harvesting applications has become a hot topic. Among these materials, Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) and BaTi0.89Sn0.11O3 (BTSn) are considered as potential candidates due to their enhanced properties. Here, the structural, electrical, properties (1 - x)Ba0.85Ca0.15Zr0.10Ti0.90O3-xBaTi0.89Sn0.11O3 (xBTSn, x = 0.2, 0.4 0.6) system investigated. A systematic study structural xBTSn samples was carried out using X-ray diffraction,...
Electrocaloric effect (ECE), i.e., a reversibly change in the temperature of an electrocaloric material due to adiabatically applied electric field, is very attractive phenomenon its applications, for example refrigeration. The first observations giant ECE were based on indirect measurements polarization and not direct itself. By using we show existence PMN ceramics near field-induced ferroelectric phase transition.
The specific rare-earth species substituted into BiFeO<sub>3</sub> influences the phase composition, domain structure, strain–electric-field behavior and piezoelectric response at elevated temperatures.
The high Curie temperature (TC ∼ 825 °C) of BiFeO3 has made this material potentially attractive for the development high-TC piezoelectric ceramics. Despite significant advances in search new BiFeO3-based compositions, behavior parent at elevated temperatures remains unexplored. We present here a systematic analysis converse, longitudinal response measured situ as function (25–260 °C), driving-field frequency, and amplitude. Earlier studies performed room revealed that frequency field...
Design of a low-cost, eco-friendly, self-poled and flexible piezoelectric nanogenerator based on lead-free H 2 (Zr 0.1 Ti 0.9 ) 3 O 7 piezo-nanowires polylactic acid biodegradable piezopolymer.
Sm-doped Pb(Mg1/3Nb2/3)O3–PbTiO3 (Sm-PMN–PT) bulk materials have revealed outstanding ferroelectric and piezoelectric properties due to enhanced local structural heterogeneity. In this study, we further explore the potential of Sm-PMN–PT by fabricating epitaxial thin films pulsed laser deposition, revealing that Sm doping significantly improves capacitive energy-storage, piezoelectric, electrocaloric, pyroelectric PMN–PT films. These exhibit fatigue-free performance up 109 charge–discharge...
The conditions for the topochemical transformation of variously sized Bi4Ti3O12 template plates into BaTiO3 particles were studied in order to control their morphology, crystal structure, and preferential orientation. In from sub-200 nm- μm-sized presence surplus BaCO3 (Bi4Ti3O12/BaCO3 = 1:10), final retained a memory precursor size when conversion reaction molten salt (NaCl/KCl) occurred at 660 900 °C, respectively. both cases side length was well preserved, while thicknesses larger...
Changes to the crystal structure of $0.70\mathrm{Pb}(\mathrm{M}{\mathrm{g}}_{1/3}\mathrm{N}{\mathrm{b}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}0.30\mathrm{PbTi}{\mathrm{O}}_{3}$ (PMN-0.30PT) piezoceramic under application electric fields at long-range and local scale are revealed by in situ high-energy x-ray diffraction (XRD) pair-distribution function (PDF) analyses, respectively. The unpoled samples is identified as monoclinic $Cm$ both scale. In XRD results suggest that field-induced...
The polarization and strain response of ferroelectric materials at electric fields below the macroscopic coercive field is paramount importance for operation many electronic devices. real related is, in general, complex difficult to interpret. reason this that processes a material contribute its properties, often concurrently. Examples include motion ferroelastic domains, presence domains within dynamics different types polar nano-entities, interaction nano-entities (e.g., nanoregions...