Abstract
In this work, Pb(Zn 1/3 Nb 2/3 )O 3 (PZN)-BaTiO 3 (BT)-Pb(Zr 0.52 Ti 0.48 )TiO 3 (PZT) ceramics were prepared by solid phase reactions via Columbite method. Relevant oxide powders were mixed and processed using microwave sintering (MS) and conventional sintering (CS) techniques. PZN-PZT-BT ceramics using partially crystallized powders exhibited similar ferroelectric characteristics in polarization-electric field measurements regardless the sintering methods, but MS samples might show more dispersion in the dielectric constant curves as a function of frequency in the weak-field dielectric properties. However. MS specimens fabricated from fully crystallized powder exhibit much better electrical properties than the CS specimens. TEM investigations of PZN-PZT-BT ceramics reveal that the MS specimens often show smaller, less-uniform grains and more complicated domain arrangements may exist. Besides, the results imply that microstructures of the specimens can be improved using microwave sintering if well-crystallized powders were adopted, and therefore enhance the electrical properties.
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