Abstract
Sodium bismuth titanate (BNT) nanopowder of molar composition 50/50 (Na0.5Bi0.5TiO3) was prepared by a sol-gel processing method. The structure and microstructure of the precursor gel as well as the ferroelectric, pyroelectric, dielectric and piezoelectric properties of the BNT were studied. BNT crystallized in the rhombohedra perovskites structure Na0.5Bi0.5TiO3 was obtained from the precursor gel by heating at 700°C for 2h in air. The BNT ceramic at 1100°C sintering temperature present high crystallinity, good dielectric properties at 1kHz (ε′=885, tan δ=0.03, Tc=370°C), piezoelectric properties (k33=0.39, c33=105GPa, e33=12.6C/m2, d33=120pC/N), high remnant polarization (Pr=47μC/cm2) and pyroelectric coefficient (p=707μC/m2K) and low coercive field (Ec=55kV/cm). Hence, the BNT prepared by sol-gel method could be used for silicon based memory device application where a low synthesis temperature is a key requirement.
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