HIGH DIELECTRIC-CONSTANTS IN BATIO3 DOPED 90V2O5-10BI2O3 OXIDE GLASSES OBEYING DEBYE-TYPE DIELECTRIC-RELAXATION BEHAVIOR

BaTiO3 doped 90V2O5-10Bi2O3 (VB) oxide glasses show a larger dielectric constant (10(2)-10(4)) compared to that of the base glass VB (approximately 10(2)). The VB glass with 15 wt. % BaTiO3 shows the largest dielectric constant, and all the glasses show a Debye-type dielectric relaxation behavior. The increase in dielectric constant appears to be mainly due to the formation of microcrystalline clusters of BaTiO3 (1.8-8 mum, depending on the BaTiO3 concentration present in the base glass). Other than the dilution effect with BaTiO3, the glass-former oxide Bi2O3 also influences the dielectric behavior of BaTiO3 doped VB glasses.