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

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Abstract:

Submicron-structured (Bi0.5Na0.5)0.94Ba0.06TiO3 (BNBT6) dense ceramics, from nanometric powder synthesized by sol gel auto-combustion at 500°C and obtained by hot-pressing (800°C-2h) and subsequent recrystallization at moderate temperature (1000-1050°C-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 160°C, being k15≈30% and d15≈250 pC.N-1 at 130°C. 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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Periodical:

Advances in Science and Technology (Volume 90)

Pages:

12-18

DOI:

https://doi.org/10.4028/www.scientific.net/AST.90.12

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Online since:

October 2014

Authors:

Lorena Pardo*, Alvaro García, Klaus Brebøl, Elisa Mercadelli, Carmen Galassi

Keywords:

Barium Titanate, Bismuth Sodium Titanate, Ferroelectric, Lead-Free, Phase Transition, Piezoelectric Ceramic (PZT), Shear Resonances

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* - Corresponding Author

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