Thermal depolarization of lead-free (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics monitored by shear resonance of thickness-poled plates (Comunicazione a convegno)

Type

• Comunicazione a convegno (Classe)
• Prodotto della ricerca (Classe)

Label

• Thermal depolarization of lead-free (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics monitored by shear resonance of thickness-poled plates (Comunicazione a convegno) (literal)

Anno

• 2011-01-01T00:00:00+01:00 (literal)

Alternative label

• Pardo, Lorena; Mercadelli, Elisa; García, Alvaro; Brebøl, Klaus; Galassi, Carmen (2011)
  Thermal depolarization of lead-free (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics monitored by shear resonance of thickness-poled plates
  in 12th European Meeting on Ferroelectricity, Bordeaux (Francia), 26 giugno - 1 luglio 2011
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Pardo, Lorena; Mercadelli, Elisa; García, Alvaro; Brebøl, Klaus; Galassi, Carmen (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

• CODICE PUMA: /cnr.istec/2011-A3-029 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Instituto de Ciencia de Materiales de Madrid. Consejo Superior de Investigaciones Científicas (ICMM-CSIC). Cantoblanco. 28049- Madrid (Spain); CNR-ISTEC, Faenza; Limiel ApS. Langebæk. (Denmark) (literal)

Titolo

• Thermal depolarization of lead-free (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics monitored by shear resonance of thickness-poled plates (literal)

Abstract

• Submicron-structured (Bi0.5Na0.5)0.94Ba0.06TiO3 ceramics, at the Morphotropic Phase Boundary of the solid solution, were prepared from nanometric powder synthesized by sol gel auto-combustion at 500ºC. Samples were obtained by hot-pressing (800ºC-2h) and subsequent recrystallization at moderate temperature (1050ºC-1h) [1]. Accurate resonance measurements at the uncoupled shear mode of thickness-poled plates and their analysis by Alemany software [2] were carried out to obtain electromechanical coupling factors (k15) and piezoelectric (e15, d15) and elastic (sE55)coefficients. Evolution of these as a function of the temperature was determined to study the depolarization process. Results show that irreversible depoling starts from a temperature higher than 120ºC. Shear resonance modes are measurable well above the reported depolarization temperature (100ºC). A value of d15=105 pC.N-1 was measured at 160ºC. This is most probably due to a difuse phase transition from a field-induced ferroelectric (FE) phase to the low temperature non-polar phase at zero field (LTNPZF) phase. The macroscopic ferro-piezoelectricity observed may arise from the coexistence of the FE phase at the nano-scale in the LTNPZF phase (literal)

Prodotto di

• Institute of science and technology for ceramics (ISTEC) (Istituto)
• Processi e materiali per applicazioni elettromeccaniche (SP.P01.037.001) (Modulo)
• Tecnologie e materiali ceramici per applicazioni energetiche (ET.P06.010.001) (Modulo)

Autore CNR

• CARMEN GALASSI (Unità di personale interno)
• ELISA MERCADELLI (Persona)

Insieme di parole chiave

• Keywords of "Thermal depolarization of lead-free (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics monitored by shear resonance of thickness-poled plates" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of science and technology for ceramics (ISTEC) (Istituto)
• Tecnologie e materiali ceramici per applicazioni energetiche (ET.P06.010.001) (Modulo)
• Processi e materiali per applicazioni elettromeccaniche (SP.P01.037.001) (Modulo)

Autore CNR di

• CARMEN GALASSI (Unità di personale interno)
• ELISA MERCADELLI (Persona)

Insieme di parole chiave di

• Keywords of "Thermal depolarization of lead-free (Bi0.5Na0.5)0.94Ba0.06TiO3 piezoceramics monitored by shear resonance of thickness-poled plates" (Insieme di parole chiave)