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.

Pàgina web del grup de recerca

Enviaments recents

  • Influence of extrinsic contribution on the macroscopic properties of hard and soft lead zirconate titanate ceramics 

    Ochoa Guerrero, Diego A.; García García, José Eduardo; Pérez Pérez, Rafael; Albareda Tiana, Alfonso (Institute of Electrical and Electronics Engineers (IEEE), 2008-12)
    Article
    Accés obert
    In this work, the contribution of the extrinsic effect to the macroscopic properties in soft and hard lead zirconate titanate ceramics is directly evaluated. Close to the room temperature, poled hard ceramics show an ...
  • Nonlinear behavior in a piezoelectric resonator: a method of analysis 

    García García, José Eduardo; Pérez Pérez, Rafael; Albareda Tiana, Alfonso; Minguella Blasco, Enric (Institute of Electrical and Electronics Engineers (IEEE), 2000-07)
    Article
    Accés obert
    Theories used for understanding nonlinear behavior of piezoelectric resonators are usually only valid for a given range of amplitudes. Thus, important discrepancies can sometimes be observed between theory and experiment. ...
  • Unexpected dielectric response in lead zirconate titanate ceramics: The role of ferroelectric domain wall pinning effects 

    García García, José Eduardo; Gomis Arbonès, Vicente; Pérez Pérez, Rafael; Albareda Tiana, Alfonso; Eiras, Jose A. (2007-07)
    Article
    Accés obert
    Temperature dependent dielectric response has been measured in Pb(Zr1-xTix)O-3 ceramics. Samples of different compositions (x=0.40, 0.47, and 0.60), pure and doped with Nb-or Fe, were studied at temperatures between 15 and ...
  • Optimization of elastic nonlinear behavior measurements of ceramic piezoelectric resonators with burst excitation 

    Albareda Tiana, Alfonso; Pérez Pérez, Rafael; Casals Mirones, Jorge; García García, José Eduardo; Ochoa Guerrero, Diego A. (Institute of Electrical and Electronics Engineers (IEEE), 2007-10)
    Article
    Accés obert
    A system of nonlinear measurement and nonlinear elastic characterization of resonators is presented, which increases the possibilities and characteristics of the other classic nonlinear characterization methods. This ...
  • Light-induced capacitance tunability in ferroelectric crystals 

    Páez Margarit, David; Rubio Marcos, Fernando; Ochoa Guerrero, Diego A.; Del Campo Garcia, Angel Adolfo; Fernández Lozano, José Francisco; García García, José Eduardo (2018-07-05)
    Article
    Accés restringit per política de l'editorial
    The remote controlling of ferroic properties with light is nowadays a hot and highly appealing topic in materials science. Here, we shed light on some of the unresolved issues surrounding light–matter coupling in ferroelectrics. ...
  • Enhancement of piezoelectric properties stability of submicron-structured piezoceramics obtained by spark plasma sintering 

    Ochoa Guerrero, Diego A.; Suñol Galofre, Francesc Xavier; Rubio Marcos, Fernando; García García, José Eduardo (Elsevier, 2018-06-19)
    Article
    Accés restringit per política de l'editorial
    Grain-size effect on functional properties of piezoceramics is nowadays an important topic due to the potential applications of these materials at the submicron scale. In this context, we explore the effect of the grain ...
  • La modernitat de Galileu, 450 anys després del seu naixement 

    Ferrer Anglada, Núria (Societat Andorrana de Ciències, 2017-01-01)
    Capítol de llibre
    Accés restringit per política de l'editorial
  • Low Weber number jet collision regimes in microgravity 

    Suñol Galofre, Francesc Xavier; González Cinca, Ricardo (2017-11-01)
    Article
    Accés restringit per política de l'editorial
    The outcome of the collision between two liquid jets depends on the liquid properties, jet velocity, and impact angle. So far studies on liquid jet impingement have been carried out in normal gravity conditions. In ...
  • Relationship between the two-component system 1-Br-adamantane + 1-Cl-adamantane and the high-pressure properties of the pure components 

    Barrio Casado, María del; Levit Valenzuela, Rafael; Lloveras Muntané, Pol Marcel; Aznar Luque, Araceli; Negrier, Philippe; Mondieig, Denise; Tamarit Mur, José Luis (2018-03-15)
    Article
    Accés obert
    The temperature-composition phase diagram of the two-component system 1-Br-adamantane and 1-Cl-adamantane has been determined by means of thermal analysis techniques and X-ray powder diffraction from the low-temperature ...
  • Limit cycle bifurcations in resonant LC power inverters under zero current switching strategy 

    Benadero García-Morato, Luis; Ponce, Enrique; El Aroudi, Abdelali; Torres Peral, Francisco (2018-01)
    Article
    Accés restringit per política de l'editorial
    The dynamics of a DC-AC self-oscillating LC resonant inverter with a zero current switching strategy is considered in this paper. A model that includes both the series and the parallel topologies and accounts for parasitic ...
  • Insight into the dynamics of low temperature dielectric relaxation of ordinary perovskite ferroelectrics 

    Levit Valenzuela, Rafael; Ochoa Guerrero, Diego A.; Martínez García, Julio Cesar; García García, José Eduardo (2017-11-10)
    Article
    Accés obert
    The 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 ...
  • Sliding bifurcations in resonant inverters 

    El Aroudi, Abdelali; Ponce Núñez, Enrique; Benadero García-Morato, Luis; Martínez Salamero, Luis (2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    In this paper, the switching dynamics of a dc-ac resonant self-oscillating inverter is considered. Using bifurcation analysis coexisting steady-state solutions are predicted, which are increasingly ...

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