UPCommons està en procés de migració del dia 10 fins al 14 Juliol. L’autentificació està deshabilitada per evitar canvis durant aquesta migració.

Browsing by Subject "Ferroelectric crystals"

Now showing items 1-11 of 11

    • 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
      Open Access
      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 ...

    • Ferroelectric domain engineering by focused infrared femtosecond pulses 

      Chen, Xin; Karpinski, Pawel; Shvedov, Vladlen; Koynov, Kaloian; Wang, Bingxia; Trull Silvestre, José Francisco; Cojocaru, Crina; Krolikowski, Wieslaw; Sheng, Yan (2015-10-05)
      Article
      Open Access
      We demonstrate infrared femtosecond laser-induced inversion of ferroelectric domains. This process can be realised solely by using tightly focused laser pulses without application of any electric field prior to, in conjunction ...

    • Ferroelectric materials for photovoltaics 

      Vázquez Calvo, Diego (Universitat Politècnica de Catalunya, 2017-09-07)
      Master thesis
      Open Access
      Ferroelectric photovoltaic has been intensively studied during the last years due to possible high efficient charge separation by presence of an internal electric field. Ferroelectric materials show permanent electrical ...

    • Frequency doubling in SBN crystal affected by poling and thermal treatment 

      Yao, Can (Universitat Politècnica de Catalunya, 2009-09-09)
      Master thesis
      Open Access
      The random anti-parallel micro-ferroelectric domains in SBN (Strontium-Barium Niobate, Sr0.61Ba0.39Nb2O3, ) crystal can be used for efficient nonlinear optical processes at different frequencies. The ferroelectric domains ...

    • 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 ...

    • New insights into the optical control of macroscopic polarization in ferroelectric crystals 

      Páez Margarit, David (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access

    • 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 ...

    • 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 ...

    • Theoretical study of Cerenkov-type second-harmonic generation in periodically poled ferroelectric crystals 

      Sheng, Yan; Kong, Qian; Roppo, Vito; Kalinowski, K.; Wang, Qi; Cojocaru, Crina; Krolikowski, W. (2012-03)
      Article
      Open Access
      We study theoretically the Čerenkov-type second-harmonic generation by a Gaussian beam in quadratic nonlinear media with periodically reverted ferroelectric domains. In particular, we consider the role of fundamental ...

    • Three-dimensional simulation of crack propagation in ferroelectric polycrystals: Effect of combined toughening mechanisms 

      Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2014-02-15)
      Article
      Restricted access - publisher's policy
      We simulate the fracture processes of ferroelectric polycrystals in three dimensions using a phase-field model. In this model, the grain boundaries, cracks and ferroelectric domain walls are represented in a diffuse way ...