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Characterization of Nanostructured Phases and Peculiar Phase Transitions in BNBT Lead-Free Piezoceramics

AuthorsPardo, Lorena CSIC ORCID; García, Álvaro CSIC; Brebøl, Klaus; Mercadelli, Elisa; Galassi, Carmen
KeywordsBismuth sodium titanate
Barium Titanate
Piezoelectric Ceramics
Phase Transitions
Shear Resonances
Issue DateOct-2014
PublisherTrans Tech Publications
CitationAdvances in Science and Technology 90: 12-18 (2014)
AbstractSubmicron-structured (Bi0.5Na0.5)0.94Ba0.06TiO3 (BNBT6) dense ceramics, from nanometric powder synthesized by sol gel auto-combustion at 500ºC and obtained by hot-pressing (800ºC-2h) and subsequent recrystallization at moderate temperature (1000-1050ºC-1h), have been studied. In-situ measurements at the shear mode of electromechanical resonance of non-standard thickness-poled shear plates as a function of the temperature show higher depolarization temperature than measurements at the radial mode of thin disks. Shear mode related material coefficients are measurable up to 160ºC, being k15≈30% and d15≈250 pC.N-1 at 130ºC. Depolarization is a complex phenomena caused by a ferroelectric (FE) macrodomains thermal randomization and a phase transition from the field-induced FE phase to a relaxor phase. The early stage of such a transition involves a non-negligible piezoelectricity arising most probably by the percolative coexistence of ferroelectric macrodomains in the resonator under the given stress field for each resonance mode.
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