Dielectric and optical properties -: Structure correlations in NiO doped Li2O-MgO-B2O3 glasses

Glasses of the system, Li2O-MgO-B2O3 containing different concentrations of NiO (ranging from 0 to 1.0 mol %) were prepared. A number of studies viz., dielectric properties (constant epsilon, loss tan delta, ac conductivity sigma(ac) over a range of frequency and temperature and dielectric breakdown strength) optical absorption, magnetic susceptibility and thermoluminescence oil these glasses were carried out as a function of NiO concentration. An anomaly has been observed in all these properties when the concentration of NiO is about 0.6 mol% in the glass matrix. This has been explained in the light variation ill the environment of Ni2+ ions in the glass network.