J. Phys. III France
Volume 7, Numéro 5, May 1997
Page(s) 951 - 961
DOI: 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 Raju3

1  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)

Dielectric constant $\varepsilon{'}$, loss tan $\delta$ and conductivity $\sigma$, 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 $\varepsilon{'}$ and tan $\delta$ 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.

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