Anisotropy and dynamic thermal depolarization of 0.96(Bi0.5Na0.5)TiO3-0.04 BaTiO3 lead-free piezoceramics (Contributo in atti di convegno)

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Label
  • Anisotropy and dynamic thermal depolarization of 0.96(Bi0.5Na0.5)TiO3-0.04 BaTiO3 lead-free piezoceramics (Contributo in atti di convegno) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • Pardo, Lorena; Garcia, Alvaro; Brebol, K.; Mercadelli, E.; Galassi, C. (2012)
    Anisotropy and dynamic thermal depolarization of 0.96(Bi0.5Na0.5)TiO3-0.04 BaTiO3 lead-free piezoceramics
    in 21st IEEE International Symposium on Applications of Ferroelectrics (ISAF-2012); 11th European Conference on Applications of Polar Dielectrics (ECAPD-2012); 4th Conference "Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials" (PFM-2012)., Aveiro, Portugal, 2012
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Pardo, Lorena; Garcia, Alvaro; Brebol, K.; Mercadelli, E.; Galassi, C. (literal)
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  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Consejo Superior de Investigaciones Cientificas (CSIC) Institute of Science and Technology for Ceramics (ISTEC-CNR) (literal)
Titolo
  • Anisotropy and dynamic thermal depolarization of 0.96(Bi0.5Na0.5)TiO3-0.04 BaTiO3 lead-free piezoceramics (literal)
Abstract
  • Undoped (Bi0.5Na0.5)(0.96)Ba0.04TiO3 ceramics were prepared from mixed oxides and sol-gel autocombustion powder. Similar dielectric and electromechanical properties were found for both but sol-gel derived ceramics can be obtained with a lower thermal budget, which prevent losses of volatiles. Dielectric anisotropy is observed. All the features of the thermal evolution curves of epsilon(T)(11) are observed at temperatures clearly displaced towards higher values with respect to those of the epsilon(T)(33) curves. There is also anisotropy in the depoling process. When depoling is monitored in-situ using the shear mode of thickness poled plates, resonance is observed at T-d > 150 degrees C. Besides, hot in-situ measurements of time dependence of the resonaces of disks and plates at temperatures below Td showed that the depolarization of BNBT4 is a dynamical process. (literal)
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