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

  • 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 (2017-11-22)
    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 ...
  • Analysis of nonlinear and non-smooth dynamics of a self-oscillating series resonant inverter 

    Benadero García-Morato, Luis; Ponce Núñez, Enrique; El Aroudi, Abdelali (2017)
    Text en actes de congrés
    Accés obert
    In 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. Our system is defined by two symmetric configurations and its ...
  • THz time-domain spectroscopy and IR spectroscopy on MoS2 

    Arcos, David; Gabriel Cortés, Daniel; Dumcenco, Dumitru; Kis, Andras; Ferrer Anglada, Núria (2016-12-09)
    Article
    Accés restringit per política de l'editorial
    In the increasing research field of 2D materials such as graphene, molybdenum disulfide MoS2 has attracted great interest due to the existence of a direct bandgap in monolayer MoS2, which gives the possibility of achieving ...
  • Understanding the piezoelectric properties in potassium-sodium niobate-based lead-free piezoceramics: interrelationship between intrinsic and extrinsic factors 

    Rubio-Marcos, Fernando; Fernández Lozano, José Francisco; Ochoa Guerrero, Diego A.; García García, José Eduardo; Rojas-Hernandez, Rocio E.; Castro, Miriam; Ramajo, Leandro (Elsevier, 2017-09)
    Article
    Accés restringit per política de l'editorial
    Lead zirconate titanate (PZT) based ceramics are currently enjoying a wide use in piezoelectric devices despite lead toxicity. Due to growing environmental concerns, the attention on piezoelectric ceramics has been moving ...
  • Low temperature dielectric relaxation in ordinary perovskite ferroelectrics: enlightenment from high-energy x-ray diffraction 

    Ochoa Guerrero, Diego A.; Levit Valenzuela, Rafael; Fancher, Christopher M.; Esteves, Giovanni; Jones, Jacob L.; García García, José Eduardo (2017-04-26)
    Article
    Accés restringit per política de l'editorial
    Ordinary ferroelectrics exhibit a second order phase transition that is characterized by a sharp peak in the dielectric permittivity at a frequency-independent temperature. Furthermore, these materials show a low temperature ...
  • Enhanced dielectric performance of a block copolymer-polythiophene nanocomposite 

    Pérez Madrigal, Mª del Mar; Ochoa Guerrero, Diego A.; García García, José Eduardo; Armelín Diggroc, Elaine Aparecida; Alemán Llansó, Carlos (2016-09-15)
    Article
    Accés obert
    Dielectric elastomer actuators (DEAs) transform electrical energy into mechanical work. However, despite displaying exceptional features, the low permittivity of elastomers restricts their application. Hence, to overcome ...
  • Elastic, dielectric and electromechanical properties of (Bi0.5Na0.5)TiO3-BaTiO3 piezoceramics at the morphotropic phase boundary region 

    Machado, Rodrigo; dos Santos, Valdeci B.; Ochoa Guerrero, Diego A.; Cerdeiras Montero, Elena; Mestres, Lourdes; García García, José Eduardo (2017-01-05)
    Article
    Accés restringit per política de l'editorial
    A 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 ...
  • Effect of lanthanide doping on structural, microstructural and functional properties of K0.5Na0.5NbO3 lead-free piezoceramics 

    Vendrell Villafruella, Xavier; García García, José Eduardo; Cerdeiras Montero, Elena; Ochoa Guerrero, Diego A.; Rubio-Marcos, Fernando; Fernández Lozano, José Francisco; Mestres Vila, Lourdes (2016-11-15)
    Article
    Accés restringit per política de l'editorial
    Lanthanides-doped K0.5Na0.5NbO3(KNN) lead-free piezoelectric ceramics are prepared by conventional solid-state reaction. The effects of lanthanum concentration and the lanthanide type on the structure, microstructure and ...
  • High stability of properties in morphotropic phase boundary Bi0.5Na0.5TiO3-BaTiO3 piezoceramics 

    Machado, Rodrigo; Ochoa Guerrero, Diego A.; dos Santos, Valdeci B.; Cerdeiras Montero, Elena; Mestres Vila, Lourdes; García García, José Eduardo (2016-11-15)
    Article
    Accés restringit per política de l'editorial
    The (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 ...
  • Bifurcation analysis of a DC–DC bidirectional power converter operating with constant power loads 

    Cristiano, Rony; Pagano, Daniel J.; Benadero García-Morato, Luis; Ponce, Enrique (2016-04)
    Article
    Accés obert
    Direct current (DC) microgrids (MGs) are an emergent option to satisfy new demands for power quality and integration of renewable resources in electrical distribution systems. This work addresses the large-signal stability ...

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