| Numéro |
J. Phys. III France
Volume 7, Numéro 5, May 1997
|
|
|---|---|---|
| Page(s) | 951 - 961 | |
| DOI | https://doi.org/10.1051/jp3:1997167 | |
J. Phys. III France 7 (1997) 951-961
Dielectric Dispersion in CuO Doped ZnF 2-PbO-TeO 2 Glasses
V. Ravi Kumar1, N. Veeraiah1, S. Buddhudu2 and V. Jaya Tyaga Raju31 Department of Physics, Nagarjuna University P.G. Centre, Nuzvid-521 201 A.P., India
2 Department of Physics, Sri Venkateswara University, Tirupati-521 502 A.P., India
3 Department of Chemistry, Osmania University, Hyderbad-500 007 A.P., India
(Received 2 May 1996, revised 20 August 1996 and 29 January 1997, accepted 6 February 1997)
Abstract
Dielectric constant
, loss tan
and conductivity
, of 45ZnF
2-9PbO-(
46 - x) TeO
2-xCuO glasses (with
x values ranging from 0.2 to 0.6) are studied as a function of frequency in the range 10
2 to 10
7 Hz and in the temperature range 30 to 200 °C. All these glasses are found to exhibit dipolar relaxation effects. The variation
in
and tan
with frequency and temperature are observed to be strongly dependent on the concentration of CuO. The observed relaxation
effects are described by Classius-Mossotti Debye relation with a set of relaxation times. The possible nature of relaxing
dipoles is discussed.
© Les Editions de Physique 1997