Abstract
In the present study, neodymium-doped lithium silicate glasses have been prepared by the
conventional melt-quenching technique. The dielectric properties, electric modulus and electrical
conductivity of SiO2-Li2O (SiLi-0Nd) and SiO2-Li2O:Nd2O3 (SiLi-1.35Nd) have been studied from
1 Hz to 1 MHz in the 333–423 K temperature range. At a given temperature and frequency, we
observe that the resistivity increases while the conductivity accordingly decreases when neodymium
ions are added to the glass matrix. The activation energy of two distinct regions was evaluated from
the ln(dc)=f(1/T) plot and was found to be E1(T<363K)=0.61(0.66)eV and
E2(T>363K)=1.26(1.09)eV for SiLi-0Nd (SiLi-1,35Nd). The dielectric constant (Re) decreases
while the dielectric loss (tan ()) increases under Nd2O3 doping. We also observe that for both
glasses, Re and tan () tend to increase with increasing temperature and decrease with increasing
frequency.