Now showing items 1-20 of 74

    • Applied Instrumentation : student works 

      Pradell Cara, Trinitat; García García, José Eduardo; Casas Piedrafita, Óscar (Universitat Politècnica de Catalunya, 2022)
      Coursework
      Open Access
      Conté els treballs dels estudiants de l'assignatura: 1. Exospheric Mass Spectrometer (EMS). The heart of a lunar sensor. J. Bonet, G. Izquierdo, B. Ros, A. Sánchez, M. Sánchez; 2. James Webb Space Telescope: an Overview . ...
    • Applied instrumentation : student works 

      Pradell Cara, Trinitat; García García, José Eduardo; Casas Piedrafita, Óscar (Universitat Politècnica de Catalunya, 2021)
      Coursework
      Open Access
      Conté els treballs dels estudiants de l'assignatura: Técnicas de diagnóstico por imagen médica activa: PET-TAC / P. Gómez, M. Hérault, X. Povill, R. Pujadas, D. Quiles -- Ultrasons 3D per a la visualització no invasiva del ...
    • Applied Instrumentation : student works 

      Pradell Cara, Trinitat; García García, José Eduardo; Casas Piedrafita, Óscar (Universitat Politècnica de Catalunya, 2023)
      Coursework
      Open Access
    • Applied Instrumentation Student works. 

      García García, José Eduardo; Pradell Cara, Trinitat; Casas Piedrafita, Óscar (Universitat Politècnica de Catalunya, 2016)
      Coursework
      Open Access
    • 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
      Open Access
      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 ...
    • Concomitant light-reversible magnetic response in multiferroic oxide heterostructures for multiphysics applications 

      López Sánchez, Jesús; Del Campo Garcia, Angel Adolfo; Quesada, Adrián; Rivelles, Alejandro; Abuín, Manuel; Sainz, Raquel; Sebastiani-Tofano, Eugenia; Rubio Zuazo, Juan; Ochoa Guerrero, Diego A.; Fernández Lozano, José Francisco; García García, José Eduardo; Rubio Marcos, Fernando (2024-04-17)
      Article
      Open Access
      The concept of multiphysics, where materials respond to diverse external stimuli, such as magnetic fields, electric fields, light irradiation, stress, heat, and chemical reactions, plays a fundamental role in the development ...
    • 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
      Open Access
      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 ...
    • Design and characterization of immersion ultrasonic transducers for pulsed regime applications 

      Suñol Galofre, Francesc Xavier; Ochoa Guerrero, Diego A.; Suñé, Laura R.; García García, José Eduardo (2019)
      Article
      Open Access
      Ultrasonic transducer design is focused to maximize performance in specific applications, usually leading to a complex design and expensive construction and assembly. With the aim to overcome ...
    • 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)
      Article
      Open Access
      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
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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
      Open Access
      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
      Restricted access - publisher's policy
      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 ...
    • Effect of the incorporation of BiFeO3 on the structural, electrical and magnetic properties of the lead-free Bi0.5Na0.5TiO3 

      Zuñiga-Mera, Pablo W; Gaona Jurado, Sonia; Guerrero, Alejandra Isabel; Villaquirán Raigoza, Claudia Fernanda; García García, José Eduardo (2021-11-05)
      Article
      Open Access
      Powders 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 ...
    • 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
      Restricted access - publisher's policy
      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
      Open Access
      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
      Open Access
      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)
      Article
      Open Access
      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 for a dynamics crossover and its implication on the freezing temperature determination of relaxor ferroelectrics 

      Levit Valenzuela, Rafael; Ochoa Guerrero, Diego A.; Martínez García, Julio Cesar; García García, José Eduardo (Institute of Physics (IOP), 2019-09-27)
      Article
      Open Access
      Relaxor ferroelectrics are characterized by a broadened and dispersive permittivity peak in their temperature-dependent dielectric spectra. Although several models have been proposed to explain the nature of these materials, ...
    • 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
      Open Access
      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, ...