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Effects of nano-sized BiFeO3 addition on the properties of high piezoelectric response (1 − x)Bi0.5Na 0.5TiO 3–xBi 0.5K 0.5TiO 3 ceramics

Moosavi, Azam, Bahrevar, Mohammad Ali, Aghaei, Ali Reza, Castro, Alicia, Ramos, Pablo, Algueró, Miguel, Amorín, Harvey
Journal of materials science 2015 v.50 no.5 pp. 2093-2102
ceramics, crystal structure, electrical properties, lead, microstructure, ozone, temperature
The role of BiFeO₃addition on the crystal structure, microstructure, and the electrical and electromechanical properties of high-sensitivity Bi₀.₅Na₀.₅TiO₃–Bi₀.₅K₀.₅TiO₃ferroelectric ceramics for compositions at the morphotropic phase boundary (MPB) is investigated. A perovskite solid solution from nano-sized BiFeO₃and Bi₀.₅Na₀.₅TiO₃–Bi₀.₅K₀.₅TiO₃powders is obtained, in which the persistence of a MPB in the ternary system is demonstrated. The structural characterization, along with the electrical properties, indicates the stabilization of intermediate domain configurations, associated with a decrease of the temperature for the development of the ferroelectric long-range order. As a consequence, high phase-change electromechanical response is found for certain small BiFeO₃additions. This result is very promising for the processing of textured ceramics taking advantage of the decomposition behaviour of BiFeO₃. Ceramic texturing is demonstrated, a key technology for developing lead-free piezoelectrics that can replace Pb(Zr,Ti)O₃.