Exploració per tema "Ferroelectricitat"
Ara es mostren els items 1-20 de 44
-
3d optical tomography of ferroelectric domains and domain walls
(Universitat Politècnica de Catalunya, 2022-09-07)
Projecte Final de Màster Oficial
Accés obert
Realitzat a/amb: Kungliga Tekniska högskolanIn ferroelectric materials, the spontaneous polarization can be reversibly switched by an applied electric field, which makes them attractive for applications in non-volatile memories and other electro-active devices. ... -
Analysis and Simulation of Distributed Nonlinearities in Ferroelectrics and superconductors for Microwave Applications
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-03-31)
Article
Accés obertThis paper gives closed-form equations for the intermodulation and third harmonic signals generated in a nonlinear transmission line with distributed quadratic nonlinearities in the conductor and dielectric. Although the ... -
Dynamics of lattice disorder in perovskite materials, polarization nanoclusters and ferroelectric domain wall structures
(Springer Nature, 2023-12-01)
Article
Accés obertThe nexus between classic ferroelectricity and the structure of perovskite materials hinges on the concept of lattice disorder. Although the ordered perovskites display short-range displacements of the central cations ... -
Elastic, dielectric and electromechanical properties of (Bi0.5Na0.5)TiO3-BaTiO3 piezoceramics at the morphotropic phase boundary region
(2017-01-05)
Article
Accés obertA systematic study of the functional properties of the (1-x)(Bi0.5Na0.5)TiO3–xBaTiO3 (BNT-xBT) piezoceramic system for 0.05 = x = 0.07 is performed. The samples are obtained through the conventional solid-state route. The ... -
Enhanced ferroelectric and piezoelectric properties of BCT-BZT at the morphotropic phase boundary driven by the coexistence of phases with different symmetries
(American Physical Society (APS), 2021-12-16)
Article
Accés obertThe discovery of lead-free piezoelectric materials is crucial for future information and energy storage applications. Enhanced piezoelectric and other physical properties are commonly observed near the morphotropic phase ... -
Enhancement of phase stability and optoelectronic performance of BiFeO3 thin films via cation co-substitution
(Royal Society of Chemistry (RSC), 2021-01-07)
Article
Accés obertCompositional engineering of BiFeO3 can significantly boost its photovoltaic performance. Therefore, controlling site substitution and understanding how it affects the optical and electronic properties while achieving ... -
Evidence for a dynamics crossover and its implication on the freezing temperature determination of relaxor ferroelectrics
(Institute of Physics (IOP), 2019-09-27)
Article
Accés obertRelaxor ferroelectrics are characterized by a broadened and dispersive permittivity peak in their temperature-dependent dielectric spectra. Although several models have been proposed to explain the nature of these materials, ... -
Exploring the electromechanical response and electric field-induced dielectric anomalies in PMN–PT electroceramics
(2021-06-23)
Article
Accés obert<jats:p> Electromechanical and dielectric properties of PMN–PT ferroelectric ceramics are investigated. In particular, dielectric response studies focus on the investigation of the influence of the DC applied electric field ... -
Extensive domain wall contribution to strain in a (K,Na)NbO3-based lead-free piezoceramics quantified from high energy X-ray diffraction
(Elsevier, 2016-08)
Article
Accés obertThe origins of high piezoelectric properties in the lead-free (K,Na)NbO3-based tetragonal composition (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 (KNL-NTS) is investigated by quantifying the intrinsic and extrinsic contributions ... -
Features of the structural and dielectric properties in BaTi1-xSnxO3 ferroelectric ceramics
(2023-07-27)
Article
Accés restringit per política de l'editorialThe demand to produce clean energy has been increasing over the last years due to the various climate changes, which are strongly afflicting the world. Therefore, it is necessary to implement new and alternative energy ... -
Ferroelectric domain engineering by focused infrared femtosecond pulses
(2015-10-05)
Article
Accés obertWe demonstrate infrared femtosecond laser-induced inversion of ferroelectric domains. This process can be realised solely by using tightly focused laser pulses without application of any electric field prior to, in conjunction ... -
Ferroelectric domain patterning with ultrafast light
(2016-12-01)
Article
Accés obert -
Giant thermal enhancement of the electric polarization in ferrimagnetic BiFe_{1-x}Co_{x}O_{3} solid solutions near room temperature
(American Institute of Physics (AIP), 2020-09-11)
Article
Accés obertThermal excitations typically reduce the electric polarization in ferroelectric materials. Here, we show by means of first-principles calculations that multiferroic BiFe 1 - x Co x O 3 solid solutions with 0.25 = x = 0.50 ... -
Giant thermal transport tuning at a metal/ferroelectric interface
(2021-10-22)
Article
Accés obertInterfacial thermal transport plays a prominent role in the thermal management of nanoscale objects and is of fundamental importance for basic research and nanodevices. At metal/insulator interfaces, a configuration commonly ... -
Growth and physical properties of highly oriented La-doped (K,Na)NbO3 ferroelectric thin films
(2015-02-27)
Article
Accés obertLead-free (K,Na)NbO3 (KNN) and La doped (K,Na)NbO3 (KNN-La) thin films are grown on SrTiO3 substrates using the chemical solution deposition method. The effect of adding different amounts of Na and K excess (0-20 mol%) is ... -
High stability of properties in morphotropic phase boundary Bi0.5Na0.5TiO3-BaTiO3 piezoceramics
(2016-11-15)
Article
Accés obertThe (1-x)Bi0.5Na0.5TiO3–xBaTiO3 (BNT-xBT) system with composition at its morphotropic phase boundary (MPB) has received significant attention because of their attractive properties as lead-free piezoceramics. Although the ... -
Insight into the dynamics of low temperature dielectric relaxation of ordinary perovskite ferroelectrics
(2017-11-10)
Article
Accés obertThe temperature dependence of the dielectric response of ordinary ferroelectric materials exhibits a frequency-independent anomalous peak as a manifestation of the ferroelectric to paraelectric phase transition. A second ... -
La3+-induced (micro)structural changes and origin of the relaxor-like phase transition in ferroelectric lead barium niobate electroceramics
(Springer, 2014-04-01)
Article
Accés obertLead barium niobate (Pb1-x Ba (x) Nb2O6, PBN) ferroelectric materials have been and are the subject of numerous studies in literature due to their potential for wide-ranging applications in the electronic industry. In this ... -
Light-driven motion of charged domain walls in isolated ferroelectrics
(American Physical Society (APS), 2022-12-26)
Article
Accés obertLight-induced ferroelectric domain wall motion turns out to be a promising phenomenon to de- velop new photo-controlled devices. However, the physical origin of this ligh-matter coupling when material is irradiated with ... -
Light-induced strain and its correlation with the optical absorption at charged domain walls in polycrystalline ferroelectrics
(Elsevier, 2023-06)
Article
Accés obertPhotostrictive materials have a growing interest because of their great potential as light-driven actuators, among other optomechanical applications. In this context, the optical control of macroscopic strain in ferroelectrics ...