Abstract
The effect of NBT content on the dielectric and piezoelectric properties in multi-ferroic ceramics [Ba(Nd0.1Ti0.8Nb0.1)O3](1−x)[Na0.5Bi0.5TiO3]x has been studied. Ceramic compositions with x = 0.00, 0.25 and 0.65 were prepared through conventional solid state sintering route. Ceramic composition with high NBT content (x = 0.65) has shown twice the value of diffusiveness of phase transition when compared to without it. The electromechanical coupling conversion of 54–69% was observed at room temperature. These ceramic samples also studied at higher temperature (673–898 K) exhibited greater than 90% electromechanical coupling conversion. These materials also studied at higher temperatures (673–898 K) showed piezoelectric charge constant of the order of nm V−1 when compared to at RT which in turn has the value of the order of pm V−1. Enhanced piezoelectric charge constant at elevated temperatures and with the increase in NBT content is attributed to the field-induced strains happening due to the presence of polarized oxygen vacancies. The results indicate that the present ceramics are best suited for high-temperature transducer application.
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