Electrical Study of Lead Calcium Titanate Borosilicate Glass Ceramics

Abstract

This chapter aimed at assessing electrical properties, viz. dielectric constant $\left({\varepsilon }_{r}\right)$ and dissipation factor $\left(\mathrm{tan}\delta \right)$ of the melt quenched synthesized glass ceramic (GC) samples in 59(PbO_xCaO_1−x) · TiO₂–40(2SiO₂ · B₂O₃)–1Fe₂O₃ composition with varying x values of 0.0, 0.1, 0.3, 0.5 and 0.7. The ${\varepsilon }_{r}$ and $\mathrm{tan}\delta$ of the GC samples were computed between the frequency ranges of 100 Hz−1 MHz by varying temperatures between 50 and 500 $^\circ{\rm C}$ throughout the heating of the samples in air. The obtained result of ${\varepsilon }_{r}$ and $\mathrm{tan}\delta$ for the five different GC samples at 500 $^\circ{\rm C}$ and at low frequency (100 Hz) lies in the range of 12,546−29,877 and 5.65−55.67, respectively. Capacitors are extensively used as an integral part of electrical circuits especially in electrical supply systems to make the voltage and power flow stable. A capacitor comprises of two electrodes that are separate out by dielectric, connecting leads and housing. The damage of one of these parts might be the reason of breakdown of the capacitors. High permittivity and breakdown voltage are the necessary qualities of the dielectric materials in order to maximize the charge carrying capacity of the capacitors. Hence, the synthesized GC with high ${\varepsilon }_{r}$ can be suitably used for high density energy storage capacitors.