Abstract
Lead silicate glasses with three composition ratio B1, B2, and B3 of (SiO2, Al2O3, Na2O, K2O, and PbO) were prepared in this
study by conventional melt quenching technique. K2O percentage increases in compositions B2 and B3 to improve physical and
electrical properties. Also glass – ceramic of lead silicate with three composition ratio C1, C2, and C3 of (SiO2, Al2O3, Na2O,
K2O, PbO, and TiO2) were prepared by conventional melt quenching technique as a first stage, and then converted to glass –
ceramic by heat treatments of the parent glass as a first step and render nucleation and crystallization as a second step. 5 wt.%
of TiO2 is used as a nucleation agent in preparing of glass – ceramic. Physical and electrical properties for all prepared
specimens were investigated; we have noted increasing of dielectric strength with increasing of sintering temperatures for glass
samples, where they have maximum value at 600°C. Whereas the glass – ceramics samples have a maximum value at C3
composition. Dissipation factor for glass and glass-ceramic samples have been decreased with increasing of K2O content at all
sintering temperatures. Dielectric constant (
r) for glass samples at low frequencies has a maximum value at B1 composition
and for sintering temperatures of 525 and 550 °C. At high frequencies, it has maximum value at B3 composition and for
sintering temperature of 550°C. Dielectric constant (
r) for glass-ceramic samples at low frequencies has a maximum value at
C1 composition, and at high frequencies it has maximum value at C3 composition.