Relaxor Characteristics of Morphotropic Phase Boundary (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3 Modified with Bi(Zn1/2Ti1/2)O3
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- Relaxor Characteristics of Morphotropic Phase Boundary (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3 Modified with Bi(Zn1/2Ti1/2)O3
- Dittmer, Robert; Jo, Wook; Daniels, John; Schaab, Silke; Roedel, Juergen
- Applied electric field; Dielectric permittivities; Electric-field-induced strain; Ferroelectric phase; In-situ; Morphotropic phase boundaries; Piezoelectric coefficient; Relative permittivity; Relaxor characteristics; Structural change; Temperature dependent; Threshold fields; TiO
- Issue Date
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.94, no.12, pp.4283 - 4290
- Morphotropic phase boundary (Bi1/2Na1/2)TiO3(Bi1/2K1/2)TiO3 (BNTBKT), was modified with increasing additions of Bi(Zn1/2Ti1/2)O3 (BZT). Microstructure, electric-field-induced strain and polarization, dielectric permittivity, and temperature-dependent piezoelectric coefficient were investigated and compared with crystal structure measured in situ as a function of applied electric field. Furthermore, permittivity and piezoelectric coefficient were characterized as a function of electric field. For small additions of BZT, an applied electric field leads to an irreversible phase transition into a ferroelectric phase with remanent polarization and a reduced relative permittivity. Increasing the content of BZT increased the threshold field for the transition. For additions of more than 2 mol% BZT, the piezoelectric coefficient dropped, permittivity remained almost constant, and a high normalized strain of up to 500 pm/V was observed. However, no field-dependent structural change was evidenced by the in situ X-ray experiment.
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