Structure and electrical properties of (Na0.5Bi0.5)0.94Ba0.06TiO3 ceramic with 0.5 wt% of MnO

Abstract

The structure and electrical properties of (Na 0.5 Bi 0.5 ) 0.94 Ba 0.06 TiO 3 ceramic doped with 0.5 wt% of MnO were investigated in comparison with those of (Na 0.5 Bi 0.5 ) 0.94 Ba 0.06 TiO 3 ceramic. It was ascertained that the MnO addition did not cause remarkable change in crystal structure and microstructure. The MnO addition mainly displayed a hard effect on the electrical properties, an increase of coercive fi eld (E c ) and mechanical quality factor (Q m ) together with a decrease of dielectric constant (ε r ) and piezoelectric constant (d 33 ). An enhancement of electromechanical coupling factor (k p ) with the MnO addition was obtained too. An essential relation between the piezoelectric properties and ferroelectric nature of the ceramics was detected. It was found that the piezoelectric properties of the ceramics highly depended on the corporative contribution of remanent polarization (P r ) and coercive fi eld.

The Effects of Ba(Zr_0.05Ti_0.95)O₃ Addition on Piezoelectric Properties and Microstructures of (Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃ Ceramics

“…This result is in agreement with the nature of the specimen with a composition near the MPB. [14] SEM micrographs of the NBBT specimens sintered at 1100 C with 0 and 1.0 mol.% of BZT are shown in Figs. 2(a)-(d), respectively.…”