CEMAD - Caracterització elèctrica de materials i dispositius
El camp central dels treballs del grup és l'estudi i la caracterització de materials per a la seva aplicació en dispositius i/o circuits. Els materials estudiats són ceràmiques i compòsits piezoelèctrics, per a les seves aplicacions en microelectrònica i optoelectrònica. L‘atenció preferent se centra en l'anàlisi i la caracterització del comportament no lineal de materials, dispositius i circuits, i en l’estudi de la relació entre les condicions d'obtenció, el desordre estructural i les propietats de transport electrònic en polímers i materials orgànics conductors. L'estudi no lineal és necessari en les aplicacions en dispositius ultrasònics que utilitzen transductors ressonants. La caracterització no lineal de convertidors electrònics commutats DC-DC sotmesos tant a controls clàssics com moderns (diagrames de bifurcacions, dinàmiques quasiperiòdiques i caòtiques...) està orientada al disseny.
Recent Submissions
-
Light-driven motion of charged domain walls in isolated ferroelectrics
(American Physical Society (APS), 2022-12-26)
Article
Open AccessLight-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 ... -
Tailoring the microstructure by a proper electric current control in flash sintering: The case of barium titanate
(Elsevier, 2022-10)
Article
Open AccessFlash sintering is arousing growing interest because high-density ceramics can be obtained at lower temperatures and shorter dwell times than conventional sintering. However, not only temperature and dwell times should be ... -
Unfolding kinetic fragility in relaxor ferroelectrics
(American Institute of Physics (AIP), 2021-10-07)
Article
Open AccessThe fragility parameter is one of the most important material constants that is extensively used in glass science, playing a central role in the enhancement of the understanding the glass formation process of disordered ... -
Effect of the incorporation of BiFeO3 on the structural, electrical and magnetic properties of the lead-free Bi0.5Na0.5TiO3
(2021-11-05)
Article
Open AccessPowders of the system (1–x)Bi0.5Na0.5TiO3–xBiFeO3 (x = 0, 0.02, 0.08, 0.10) are synthesized by the combustion reaction method. The crystal structure and the particle size of Bi0.5Na0.5TiO3 are modified by the incorporation ... -
Pure perovskite BiFeO3–BaTiO3 ceramics prepared by reaction flash sintering of Bi2O3–Fe2O3–BaTiO3 mixed powders
(2021-06)
Article
Restricted access - publisher's policyIn this work, the 0.67BiFeO3-0.33BaTiO3 ferroelectric ceramic was prepared by Reaction Flash Sintering (RFS). This preparation technique combines synthesis and sintering in a single Flash experiment. The starting oxides ... -
Exploring the electromechanical response and electric field-induced dielectric anomalies in PMN–PT electroceramics
(2021-06-23)
Article
Open Access<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 ... -
Photocontrolled strain in polycrystalline ferroelectrics via domain engineering strategy
(2021-05-05)
Article
Open AccessThe use of photonic concepts to achieve nanoactuation based on light triggering requires complex architectures to obtain the desired effect.In thiscontext, the recent discoveryof reversible optical control of the domain ... -
((R)-(-)-3-Hydroxyquinuclidium)[FeCl4]; a plastic hybrid compound with chirality, ferroelectricity and long range magnetic ordering
(Royal Society of Chemistry (RSC), 2021-02-16)
Article
Restricted access - publisher's policyQuinuclidinium salts and their derivatives are now in the focus of materials science as building units of multifunctional materials. Their properties can be easily switchable, allowing their use in a wide range of physical ... -
Toward a new PTCR material based on the Na2Ti6O13/Na2Ti3O7 system
(2021-08)
Article
Open AccessMixed phases of sodium titanate ceramics are obtained using both conventional and laser sintering methods. It was observed a clear dependence on the structural, microstructural and electrical resistivity with the employed ... -
Performance assessment of ultrasonic waves for bubble control in cryogenic fuel tanks
(2020-05-27)
Article
Open AccessAn efficient long-term storage of cryogenic propellants is a challenge for future space exploration missions. The vapour bubbles formed as a result of boil-off in the tank walls can generate foam structures, which could ... -
Bifurcation analysis in a self-oscillating series resonant converter
(De Gruyter Open Sp. z o.o., 2020-02-10)
Part of book or chapter of book
Restricted access - publisher's policyIn this paper, the dynamics of a dc-ac resonant self-oscillating LC series inverter is analyzed from the point of view of piecewise smooth dynamical systems. The system under study is defined by two symmetric configurations ... -
Polymorphic phase boundary in piezoelectric oxides
(American Institute of Physics (AIP), 2020-04-01)
Article
Open AccessThe design of phase boundaries has now become a consolidated strategy to improve the functional properties of piezoelectric oxides because of the unique properties that may be obtained in their vicinity. In particular, ...
RSS 1.0