Electrical properties of LiBBaTe glass doped with Nd2O3

The dc and ac electncal conductivity of barium tellunte borate glass doped with Nd2O3 in the composition 50 B2O3- (20-X) BaO- 20TeO(2) 10 LiF or Li2O where x = 0 5 1 1 5 and 2 Nd2O3 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 Nd2O3 content in the glasses containing LiF and by the replacement of LiF by Li2O the conductivity was found to decrease with addition of Nd2O3 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 sigma(AC) (omega) = A omega(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 epsilon' and tan delta are observed to increase with the addition of Nd2O3 whereas they decrease in the glasses containing Li2O The electrical modulus formalism has been used for studying electrical relaxation behavior in studied glasses It is for first time that the Nd2O3 doped barium tellunte borate glasses have been investigated for dc and ac conductivities and dielectric properties over a wide range of frequency and temperature (C) 2010 Elsevier Masson SAS All nghts reserved