Ara es mostren els items 1-20 de 45

  • Assessment of the functional properties stability in (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 piezoceramics: huge dielectric and piezoelectric nonlinearity 

    Ochoa Guerrero, Diego A.; Reyes Montero, Armando; Suñol Galofre, Francesc Xavier; Villafuerte Castrejón, Maria Elena; Pardo, Lorena; García García, José Eduardo (2019-02-05)
    Article
    Accés restringit per política de l'editorial
    The (Ba,Ca)(Zr,Ti)O3 ceramic system has received special attention in recent years because it may lead to promising lead-free piezoceramics. However, the stability of the functional properties of these materials is an ...
  • Contribution of reversible processes to the non-linear dielectric response in hard lead zirconate titanate ceramics 

    García García, José Eduardo; Pérez Pérez, Rafael; Albareda Tiana, Alfonso (2005-10)
    Article
    Accés obert
    Se estudia la dependencia entre la constante dieléctrica y las pérdidas con el campo eléctrico aplicado, así como entre la constante dieléctrica y las pérdidas dieléctricas. Los resultados muestran que las cerámicas PZT ...
  • Dielectric and mechanical nonlinear behavior of Mn doped PMN-35PT ceramics 

    Kobor, Diouma; Hajjaji, Abdelowahed; García García, José Eduardo; Pérez Pérez, Rafael; Albareda Tiana, Alfonso; Lebrun, Laurent; Guyomar, Daniel (2010-10)
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    This paper presents an investigation on dielectric and mechanical nonlinear properties in Mn-doped PMN-35PT ceramics. The structural study of the ceramics verifies that the 1% mol Mn doped PMN-35PT is a pure perovskite ...
  • Dielectric and piezoelectric nonlinear properties of slightly textured lead barium niobate ceramics 

    Ochoa Guerrero, Diego A.; Casals Mirones, Jorge Alejandro; Venet, Michel; M'Peko, Jean-Claude; García García, José Eduardo (American Institute of Physics (AIP), 2019-01-09)
    Article
    Accés restringit per política de l'editorial
    Dielectric and piezoelectric responses of slightly textured, lead barium niobate ceramics are studied. The designed morphotropic phase boundary composition (Pb0.63Ba0.37Nb2O6) shows considerable nonlinear dielectric and ...
  • Efeito do dopante Ba sobre as propriedades estruturais e microestruturais de ceramicas Bi0.5Na0.5TiO3 

    Santos, Valdeci Bosco dos; Cerdeiras Montero, Elena; Mestres Vila, Lourdes; Machado, Rodrigo; Ochoa Guerrero, Diego A.; García García, José Eduardo (2015)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Recently, Bi0,5Na0,5TiO3 (BNT) based ceramics has been widely studied as one promising material lead-free for piezoelectric applications. The Ba addition in BNT ((Bi0,5Na0,5)1-xBaxTiO3 - BNT-xBT) has attracted considerable ...
  • 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 obert
    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 ...
  • Effect of Mn-acceptor dopant on dielectric and piezoelectric responses of lead lanthanum zirconate titanate piezoceramics 

    Pérez Delfín, Enrique; García García, José Eduardo; Ochoa Guerrero, Diego A.; Pérez, R.; Guerrero, Fidel; Eiras, Jose A. (2011-08-01)
    Article
    Accés restringit per política de l'editorial
    Dielectric and direct piezoelectric responses in non-doped and Mn-doped Pb0.91La0.09(Zr0.65,Ti0.35)O3 ceramics are experimentally studied. The permittivity and the direct piezoelectric coefficient were measured by applying ...
  • Effects of poling process on KNN-modified piezoceramic properties 

    Marcos Rubio, F.; Romero, J. J.; Ochoa Guerrero, Diego A.; García García, José Eduardo; Pérez Pérez, Rafael; Fernández, José Francisco (2010-02)
    Article
    Accés restringit per política de l'editorial
    The influence of the orthorhombic to tetragonal phase transition near room temperature in the poling process of KNN-modified piezoceramics was studied. Poling temperatures of 25° and 120°C were used. The percentage of 90° ...
  • 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 obert
    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 ...
  • 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 ...
  • 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)
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    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 ...
  • Evidence of temperature dependent domain wall dynamics in hard lead zirconate titanate piezoceramics 

    García García, José Eduardo; Ochoa Guerrero, Diego A.; Gomis Arbonès, Vicente; Eiras, Jose A.; Pérez Pérez, Rafael (American Institute of Physics (AIP), 2012-07)
    Article
    Accés obert
    This work presents a study of the domain wall dynamics in Pb(Zr1−xTix)O3 (PZT)-based piezoceramics by means of the temperature dependence non-linear dielectric response and hysteresis loop measurements. In soft PZT, ...
  • Exploring different sintering atmospheres to reduce nonlinear response of modified KNN piezoceramics 

    Vendrell Villafruela, Xavier; García García, José Eduardo; Rubio Marcos, F.; Ochoa Guerrero, Diego A.; Mestres Vila, Lourdes; Fernández, José F. (Elsevier, 2013-04)
    Article
    Accés restringit per política de l'editorial
    Dense lead-free (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 piezoelectric ceramics are prepared by the conventional mixed oxide method. The effect of different sintering conditions (synthetic air, O2 and Ar) on some structural, ...
  • Extensive domain wall contribution to strain in a (K,Na)NbO3-based lead-free piezoceramics quantified from high energy X-ray diffraction 

    Ochoa Guerrero, Diego A.; Esteves, Giovanni; Iamsasri, Thanakorn; Rubio-Marcos, Fernando; Fernández Lozano, José Francisco; García García, José Eduardo; Jones, Jacob L. (Elsevier, 2016-08)
    Article
    Accés obert
    The 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 ...
  • Extrinsic behaviour of PZT ceramics near the morphotropic phase transition 

    Albareda Tiana, Alfonso; Pérez Pérez, Rafael; García García, José Eduardo; Tiana Alsina, Jordi; Pérez Codina, Estel (2005-09)
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    Accés obert
    The aim of this work is to study the dependence of the linear and non-linear dielectric, piezoelectric and mechanical coefficients on the Ti fraction in PZT ceramic compositions near the morphotropic phase boundary. The ...
  • Extrinsic coefficient characterisation of PZT ceramics near the morphotropic phase boundary 

    Albareda Tiana, Alfonso; Pérez Pérez, Rafael; García García, José Eduardo; Tiana Alsina, Jordi; Pérez Codina, Estel; Gorri Ochoa, José Antonio (2006-05)
    Article
    Accés obert
    El comportamiento extrínseco de las cerámicas PZT, relacionado con el movimiento de las paredes de los dominios, comporta efectos no lineales grandes. Esta correspondencia entre efectos extrínsecos y no linealidades puede ...
  • Extrinsic contribution and instability properties in lead-based and lead-free piezoceramics 

    García García, José Eduardo (2015-11-01)
    Article
    Accés obert
    Piezoceramic materials generally exhibit a notable instability of their functional properties when they work under real external conditions. This undesirable effect, known as nonlinear behavior, is mostly associated with ...
  • Extrinsic response enhancement at the polymorphic phase boundary in piezoelectric materials 

    Ochoa Guerrero, Diego A.; Esteves, Giovanni; Jones, Jacob L.; Rubio-Marcos, Fernando; Fernández Lozano, José Francisco; García García, José Eduardo (2016-04-04)
    Article
    Accés obert
    Polymorphic phase boundaries (PPBs) in piezoelectric materials have attracted significant interest in recent years, in particular because of the unique properties that can be found in their vicinity. However, to fully ...
  • Growth and physical properties of highly oriented La-doped (K,Na)NbO3 ferroelectric thin films 

    Vendrell Villafruela, Xavier; Raymond, Oscar; Ochoa Guerrero, Diego A.; García García, José Eduardo; Mestres, Lourdes (2015-02-27)
    Article
    Accés obert
    Lead-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-precision time-of-flight determination algorithm for ultrasonic flow measurement 

    Suñol Galofre, Francesc Xavier; Ochoa Guerrero, Diego A.; García García, José Eduardo (2019)
    Article
    Accés obert
    Commercial time-of-flight (TOF) ultrasonic flowme- ters are rapidly expanding in the general industry. Among the different techniques that can be applied to determine the TOF of ultrasonic waves, the cross-correlation ...