Abstract
The single phase nano-crystalline lead-free Na0.5Bi0.5TiO3 (NBT) synthesized using hydrothermal technique produces homogeneous crystalline powders. The structural phase purity of these ceramic powders was confirmed by using room temperature X-ray diffraction and it revealed that the structure stabilizes in rhombohedral (R3c) phase. The microstructure from scanning electron microscopy clearly showed the cubic-type feature in orders of 100-200 nm with sharp face edges. The Curie temperature (TC), dielectric constant (εr) and other electrical properties are strongly dependent on the particle sizes. The dielectric constant (εr = 3100 at 100 kHz) is high in comparison to reported NBT synthesized using solid state route (εr = 2700 at 100 kHz). Additionally, diffusive phase transition was clearly observed in nano NBT powders which supports its tendency towards more relaxor behavior and will be a pertinent candidate to improve the energy storage capacity.
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