Dielectric characteristics of Mg-replaced Pb[(Zn1/3Ta2/3)0.2(Zn1/3Nb2/3)0.6Ti0.2]O3 ceramics

Powders of a Pb[(Zn1/3Ta2/3)0.2(Zn1/3Nb2/3)0.6Ti0.2]O3 system with gradual replacement of Zn by Mg were prepared by employing a B-site precursor method and developed structures were studied by X-ray diffractometry. Dielectric properties of the sintered ceramics were characterized under weak-field low-frequency conditions. A high maximum dielectric constant value of 38,000 (@1 kHz) was realized when 3/4 of octahedral Zn was replaced by Mg. Field-dependent polarization responses were also monitored at various temperatures to investigate ferroelectricity. Microstructures of the fractured ceramics were examined using a scanning electron microscope.