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Title

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

AuthorsPardo, Lorena ; García, Álvaro ; Brebøl, Klaus; Mercadelli, Elisa; Galassi, Carmen
Keywordsbarium
bario
bismuth
bismuto
sodium
sodio
titanate
titanato
BNBT4
Anisotropy
Anisotropia
Depolarization
Despolarización
Piezoelectric
Ceramic
Cerámica
Piezoeléctrica
Lead-Free
Dielectric
Dieléctrico
Resonance
Resonancia
Sol-gel
Hot-pressing
Issue Date19-Nov-2012
AbstractUndoped (Bi0.5Na0.5)0.96Ba0.04TiO3 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 εT11 are observed at temperatures clearly displaced towards higher values with respect to those of the εT33 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 Td > 150ºC. 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. T 33
Publisher version (URL)DOI:10.1109/ISAF.2012.6297762
URIhttp://hdl.handle.net/10261/60586
DOI10.1109/ISAF.2012.6297762
ISBN978-1-4673-2668-1
Appears in Collections:(ICMM) Comunicaciones congresos
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