Enhanced Piezoelectric and Dielectric Responses in 92.5%(Bi0.5Na0.5) TiO3 -7.5%BaTiO3 Ceramics

Structure and piezoelectric coefficient (d33) of lead‐free 7.5% mole BaTiO3‐doped (Bi0.5Na0.5) TiO3 (BNT‐7.5%BT) polycrystalline piezoceramics have been characterized systematically as a function of poling electric (E) field. Dielectric permittivity and loss were also measured as functions of freque...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2014-06, Vol.97 (6), p.1890-1894
Main Authors: Anthoniappen, J., Lin, C.-H., Tu, C. S., Chen, P.-Y., Chen, C.-S., Chiu, S.-J., Lee, H.-Y., Wang, S.-F., Hung, C.-M.
Format: Article
Language:English
Subjects:
Barium titanates
Ceramics
Coefficients
Deoxidizing
Depolarization
Dielectric constant
Dielectrics
Distortion
Lattice vacancies
Lead free
Permittivity
Piezoelectric ceramics
Piezoelectricity
Polarization
Titanium dioxide
Walls
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Summary:Structure and piezoelectric coefficient (d33) of lead‐free 7.5% mole BaTiO3‐doped (Bi0.5Na0.5) TiO3 (BNT‐7.5%BT) polycrystalline piezoceramics have been characterized systematically as a function of poling electric (E) field. Dielectric permittivity and loss were also measured as functions of frequency and temperature. The piezoelectric coefficient d33 after poling at E = 35 kV/cm can reach d33~186 pC/N, which is the highest value reported among (1−x) BNT–xBT compositions. A prior poling E field can reduce rhomobherdal lattice distortion, and enhance tetragonal phase and polarization ordering, that contribute significantly to the rapid raise of d33 and lower depolarizing temperature (Td). The reduced dielectric permittivity for the poled sample is attributed to ordered state and the pinning of field‐induced nanodomain walls by the presence of oxygen vacancies.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.12864