LAUSR

Abstract In the present investigation, 30SiO 2 −30B 2 O 3 −10Y 2 O 3 -(30-x)CaO-xZrO 2 (x=2.5, 5,7.5, 10) system has been synthesized by melt-quench technique. The as quenched samples are characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV–visible spectroscopy and impedance analyzer. Modification in local glassy units by ZrO 2 instead of CaO leads to change optical and dielectric properties. As ZrO 2 content increases optical band gap decreases from 3.84 eV (x=2.5) to 3.74 eV (x=10). The transmittance of infrared radiation increases with increasing ZrO 2 content. The dielectric loss (Tan δ) of all the samples is less than 2% up to 500 °C at 1 MHz. The lowest dielectric constant (~12) is observed for x=7.5 with excellent temperature and frequency stability.