Electrical properties of LiBBaTe glass doped with Nd 2O 3

Abstract

The dc and ac electrical conductivity of barium tellurite borate glass doped with Nd 2O 3 in the composition 50 B 2O 3- (20-X) BaO- 20TeO 2 10 LiF or Li 2O where x = 0.5, 1, 1.5 and 2 Nd 2O 3 were measured in the temperature range 303–648 K and in the frequency range 0.1–100 kHz. The dc and ac conductivities values increase, whereas the activation energy of conductivities decreases with increasing Nd 2O 3 content in the glasses containing LiF and by the replacement of LiF by Li 2O the conductivity was found to decrease with addition of Nd 2O 3. The electrical conduction has been observed to be due to small polaron hopping at high temperatures. The frequency dependence of the ac conductivity follows the power law σ AC ( ω) = A ω s . The frequency exponent ( s) values (in the range 0.94 and 0.33) decreases with increasing temperature. The dielectric constant and dielectric loss increased with increasing temperature and decreased with increase in frequency for all glasses studied. In LiF glasses, it is observed that, the values of ɛ \\ and tan δ are observed to increase with the addition of Nd 2O 3 whereas they decrease in the glasses containing Li 2O. The electrical modulus formalism has been used for studying electrical relaxation behavior in studied glasses. It is for first time that the Nd 2O 3 doped barium tellurite borate glasses have been investigated for dc and ac conductivities and dielectric properties over a wide range of frequency and temperature.