To study the effect of network modifier ZnO on the dielectric properties of the glass system with chemical composition x ZnO-(30-x) Li2O-10TeO2-60B2O3 (where x=0, 5, 10, 15 and 20 mole %) was prepared through melt quenching technique. X-ray diffraction spectra of the prepared glasses reveal that no sharp peaks are found which indicates the amorphous nature of glass materials. The dielectric behaviour of the glasses has been studied with the help of AC conductivity measurements which are recorded from 30°C-400°C in the frequency range 5Hz-35M Hz on LCR meter. The AC conductivity data used to analyse real dielectric permittivity, loss tangent (tan δ) and activation energy (Ea). Addition of ZnO into glass matrix causes the variation in the conductivity with the creation of non-bridging oxygens (NBOs) in the glass network. At lower temperatures the results of dielectric properties of the glass system did not exhibit good results. Tangent loss and dielectric permittivity decreased with increase of frequency. The activation energy (Ea) values have been calculated from Arrhenius plots which are showing opposite behaviour to AC conductivity. The influence of density, on the results of dielectric properties has been discussed in the present investigation.

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