Dielectric, impedance relaxation and DC resistivity studies on microwave sintered Ba_1-xRe_xTiO₃(Re = Nd&Pr) ceramics using 5% SiO₂ as sintering aid

ABSTRACT

Ba_1-xRe_xTiO₃ ceramics (Re = Nd&Pr with x = 0.002 & 0.004) were prepared through microwave sintering route using 5% SiO₂ as sintering aid. The dielectric, impedance and DC resistivity studies were carried out over a wide range of temperature. From dielectric studies, it is observed that the transition temperature increased with the substitution of rare earth ions. The room temperature dielectric constant for the Nd (x = 0.002) doped barium titanate is higher when compared to other compositions and the value is 13,600.28. Impedance studies revealed relaxation behaviour. In the present study grain, grain boundary and sample-electrode effects were separated out by using Cole-Cole data. From the DC resistivity studies, it is observed that Pr (x = 0.004) doped barium titanate ceramic showed one order of magnitude PTCR effect.

KEYWORDS:

• Dielectric
• impedance
• PTCR
• grain and grain boundary resistance
• conductivity

Funding

The authors would like to thank DST and DRDO, Delhi, India for financial support to carry out the present research work.