Frequency domain measurements on Nae B 4 07 and Na2 B4 07(95%)-V2 0~(5%) glass systems have been carried out in the frequency range 10-2 to 104 Hz and temperature range 300 to 450 K. The complex capacitance has shown fractional power law dependences on frequency which obey the generalized Maxwell-Wagner relationships. The activation energy is found to increase with an increase in V2 05 composition.PACS 72.80 -Conductivity of specific semiconductors and insulators. PACS 77.40 -Dielectric loss and relaxation.