Enviaments recents

  • 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 ...
  • 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
    Accés restringit per política de l'editorial
    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 ...
  • 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 ...

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