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Title

Piezoelectric properties of lead-free Submicron-structured (Bi0.5Na0.5)0.94Ba0.06TiO3 ceramics from nanopowders

AuthorsPardo, Lorena CSIC ORCID; García, Álvaro CSIC; Brebøl, Klaus; Mercadelli, Elisa; Galassi, Carmen
KeywordsPiezoelectric
Piezoelectrica
Ceramic
Cerámica
Lead-free
Verde
Microstructure
Microestructura
Nanopowder
Nanopartícula
Ferroelectric
Ferroeléctrica
Dielectric
Dieléctrica
Structure
Estructura
Issue Date29-Sep-2011
AbstractSubmicron-structured (Bi0.5Na0.5)0.94Ba0.06TiO3 (BNBT6) ceramics were obtained from nanometric powder synthesized by sol gel auto-combustion at 500ºC. Hot-pressing at low temperatures and a combination of this with re-crystallization, still moderate in order to reduce loss of the volatile elements, have been tested. Material properties, including all losses, were determined at the resonances of thin disks using Alemany et al. software. Ceramics hot pressed at 700-800ºC for 2h have a pseudo-cubic structure, grain size of few hundreds of nanometers and are homogeneous. Both their crystal structure and the lack of sintering prevent their poling. For ceramics hot-pressed at 950ºC for 3h, Bi or (Bi0.5Na0.5) loss, together with low piezoelectric properties (d33=60 pC.N-1, kp=8%), was observed. Re-crystallization at 1000ºC-1h of ceramics hot-pressed at 700 and 800ºC for 2h keeps submicron-structure, reduces porosity and prevents off-stoichiometry. Mechanical and piezoelectric losses are also reduced and coupling factors increased (kp=24.6%, kt=36.4%). The best piezoelectric coefficient obtained in these ceramics (d33=143 pC.N-1) is comparable with those reported for coarse-grained ceramics
Publisher version (URL)http://iopscience.iop.org/0964-1726/19/11/115007
URIhttp://hdl.handle.net/10261/40316
ISSN0964-1726
Appears in Collections:(ICMM) Artículos




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