Now showing items 21-40 of 41

  • Influence of the type of rare-earth cation on electrical properties of Ba(Zr,Ti)O3 ceramics 

    Delgado del Toro, Ariel; Guerrero Peña, E; Leyet Ruiz, Yuri; Guerrero Zayas, Fidel; Mestres, Lourdes; Ochoa Guerrero, Diego A.; García García, José Eduardo (2011-02)
    Article
    Open Access
    En este artículo es investigado el efecto del radio iónico de diferentes cationes de tierras raras sobre las propiedades eléctricas del compuesto Ba(Zr,Ti)O3. La cerámica BaZr0.09Ti0.9O3 fue dopada con iones de Gd3+, Pr3+ ...
  • 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
    Open Access
    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 ...
  • Interrelationship between phase transition characteristics and piezoelectric response in lead lanthanum zirconate titanate relaxor ceramics 

    Guerra, J.D.S.; García García, José Eduardo; Ochoa Guerrero, Diego A.; Pelaíz Barranco, Aimé; García Zaldívar, Osmany; Calderón Piñar, F. (2012)
    Article
    Restricted access - publisher's policy
    Dielectric and piezoelectric responses are investigated in relaxor-like lanthanum-modified lead zirconate titanate (PLZT) ceramics, for a La/Zr/Ti ratio of x/60/40 (x = 8 and 10 at.%), obtained by the conventional ceramic ...
  • La3+-induced (micro)structural changes and origin of the relaxor-like phase transition in ferroelectric lead barium niobate electroceramics 

    Venet, Michel; Zabotto, Fabio L.; García García, José Eduardo; Ochoa Guerrero, Diego A.; García, Ducinei; Eiras, Jose A.; M'Peko, Jean-Claude (Springer, 2014-04-01)
    Article
    Open Access
    Lead 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-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
    Open Access
    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. ...
  • 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
    Open Access
    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 ...
  • Microstructural features and functional properties of bilayered BaTiO3/BaTi1-xZrxO3 ceramics 

    Martins Amaral, Thiago; Antonelli, Eduardo; Ochoa Guerrero, Diego A.; García García, José Eduardo; Hernandes, Antonio Carlos (2015-04-01)
    Article
    Open Access
    Validity of mixture rule for dielectrics in series configuration and the correlation between microstructure and electrical properties in bilayered BaTiO3/BaTi1-xZrxO3 ceramics were studied. Samples were obtained from ...
  • Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties 

    Martins Amaral, Thiago; Antonelli, Eduardo; Ochoa Guerrero, Diego A.; García García, José Eduardo; Hernandes, Antonio Carlos (2016-05-15)
    Article
    Open Access
    The dielectric, pyroelectric and ferroelectric properties of bilayered BaTiO3/BaTi0.8Zr0.2O3 ceramics are described and correlated with their microstructure. Different sintering times are employed to change the microstructure ...
  • Nonlinear dielectric response of BaBi4Ti4O15 ceramics 

    Kumar, Sunil; Ochoa Guerrero, Diego A.; García García, José Eduardo; Varma, K.B.R (2013-02-05)
    Article
    Restricted access - publisher's policy
    Nonlinear dielectric response of BaBi 4 Ti 4 O 15 ceramics synthesized via the conventional solid-state reaction route has been monitored over a wide range of electric field strengths (E 0 = 0.5-5 kV/cm). Dielectric ...
  • Nonlinear dielectric response of BaBi4Ti4O15 ceramics 

    Kumar, Sunil; Ochoa Guerrero, Diego A.; García García, José Eduardo; Varma, K.B.R (American Institute of Physics (AIP), 2012)
    Conference lecture
    Restricted access - publisher's policy
    Nonlinear dielectric response of BaBi4Ti4O15 ceramics synthesized via the conventional solid-state reaction route has been monitored over a wide range of electric field strengths (E0 = 0.5-5 kV/cm). Dielectric permittivity ...
  • 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
    Open Access
    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 ...
  • Phase transition characteristics and dielectric properties of rare-earth (La, Pr, Nd, Gd) doped Ba(Zr0.09Ti0.91)O-3 ceramics 

    Diez Betriu, Xavier; García García, José Eduardo; Ostos, Carlos; Boya Pimentel, Aurelio Urbano; Ochoa Guerrero, Diego A.; Mestres, Lourdes; Pérez Pérez, Rafael (2010-02-15)
    Article
    Restricted access - publisher's policy
    A-site deficient rare-earth doped barium zirconate titanate (BZT) ceramics (Ba1−yLn2y/3)Zr0.09Ti0.91O3 (Ln = La, Pr, Nd, Gd) are obtained by a modified solid-state reaction method. Perovskite-like single-phase compounds ...
  • Photo-controlled ferroelectric-based nanoactuators 

    Rubio Marcos, Fernando; Páez Margarit, David; Ochoa Guerrero, Diego A.; Del Campo Garcia, Angel Adolfo; Fernández Lozano, José Francisco; García García, José Eduardo (2019-04-02)
    Article
    Restricted access - publisher's policy
    Finding a feasible principle for a future generation of nano-optomechanical systems is a matter of intensive research, because it may provide new device prospects for optoelectronics and nanomanipulation techniques. Here ...
  • Physics laboratory experiments at the Barcelona Faculty of Nautical Studies 

    Isalgué Buxeda, Antonio; Ochoa Guerrero, Diego A. (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
    Conference lecture
    Open Access
  • Preisach modeling of temperature-dependent ferroelectric response of piezoceramics at sub-switching regime 

    Ochoa Guerrero, Diego A.; García García, José Eduardo (2016-04)
    Article
    Open Access
    The Preisach model is a classical method for describing nonlinear behavior in hysteretic systems. According to this model, a hysteretic system contains a collection of simple bistable units which are characterized by an ...
  • Preisach modelling of nonlinear response in electrically biased lead zirconate titanate-based piezoceramics 

    Ochoa Guerrero, Diego A.; Perez, Rafael A.; García García, José Eduardo (2013-09)
    Article
    Open Access
    The alteration of the high-field electrical permittivity (nonlinear response) of PZT-based ceramics when an electrical bias field is applied is reported in this work. Large differences are observed between soft and hard ...
  • Raman scattering, microstructural and dielectric studies on Ba1-xCaxBi4Ti4O15 ceramics 

    Kumar, Sunil; Kundu, Swarup; Ochoa Guerrero, Diego A.; García García, José Eduardo; Varma, K.B.R (2012-10)
    Article
    Restricted access - publisher's policy
    Polycrystalline powders of Ba1−xCaxBi4Ti4O15 (where x = 0, 0.25, 0.50, 0.75 and 1) were prepared via the conventional solid-state reaction route. X-ray diffraction (XRD) and Raman scattering techniques have been employed ...
  • Relaxor ferroelectric behavior and structural aspects of SrNaBi 2Nb 3O 12 ceramics 

    Kumar, Sunil; Ochoa Guerrero, Diego A.; García García, José Eduardo; Varma, K.B.R (2012-04)
    Article
    Restricted access - publisher's policy
    The SrNaBi2Nb3O12 (SNBN) powder was prepared via the conventional solid-state reaction method. X-ray structural studies confirmed the phase to be a three-layered member of the Aurivillius family of oxides. The SNBN ceramics ...
  • Respuesta extrínseca y comportamiento no lineal en materiales cerámicos piezoeléctricos 

    Ochoa Guerrero, Diego A. (Universitat Politècnica de Catalunya, 2009-02-19)
    Doctoral thesis
    Open Access
    The study of the elastic, dielectric and piezoelectric non-linear behavior in PZT-based and KNN-based piezoelectric ceramics represent the main goal of this work. Both systems present a perovskite-like structure. Several ...
  • The generalized Vogel-Fulcher-Tamman equation for describing the dynamics of relaxor ferroelectrics 

    Levit Valenzuela, Rafael; Martínez García, Julio Cesar; Ochoa Guerrero, Diego A.; García García, José Eduardo (Nature, 2019-08-27)
    Article
    Open Access
    Relaxor ferroelectrics (RF) are outstanding materials owing to their extraordinary dielectric, electromechanical, and electro-optical properties. Although their massive applications, they remain to be one of the most ...