Abstract
The influence of copper on the crystallographic phase and the microstructure of Ba1-xCuxTiO3 ceramics with the Cu2+ mole fraction, x, such as 0 ≤ x ≤ 0.30 was investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis showed that Cu lowered the temperature of calcination of the pure sample, and that this dopant may occupy one or other of Ba and Ti sites. A gradual change from tetragonal to pseudo cubic structure was observed on doping with Cu. Dielectric measurements revealed that incorporation of Cu ions gave rise to appearance of diffuse character of the ferro-to-paraelectric transition together with weak relaxation and positive temperature coefficient of resistivity (PTCR) phenomena.
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