Abstract: The bismuth-layer structured ferroelectric materials, (1-x)Na0.5Bi2.5Nb2O9-xNa0.5Bi4.5Ti4O15(NBNO-NBT-x), were fabricated by solid state sintering. It was inferred from XRD, SEM and EDS analysis that NBNO-NBT-0.5 ceramics were mainly composed of 2-4 intergrowth structured NaBi7Ti4Nb2O24, with Na0.5Bi2.5Nb2O9 and Na0.5Bi4.5Ti4O15 alternative arrangement along the c axis. The increasing asymmetry of crystal lattice led to increasing lattice stress, and the composite of NBNO and NBT further increased the ionic disorder and structural disorder, which made the ceramics exhibit different microstructure and electric properties. Compared with NBNO and NBT, NBNO-NBT-0.5 ceramics showed a larger aspect ratio, with an average grain diameter higher than 20 μm and a thickness lower than 2 μm. Meanwhile, a lower Curie temperature, a larger high temperature dielectric loss, as well as a lesser conductivity activation energy were also observed in NBNO-NBT-0.5 ceramics, and both ferroelectric and piezoelectric properties decreased.
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2018, Vol. 32 
