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Dielectric properties; LiF-B₂O₃ glasses; rare earth ions; QMT model

Dielectric constantɛ, loss tanδ and a.c. conductivityσ of LiF-B₂O₃: Ln³⁺ (where Ln=Ce, Pr, Nd and Tb) glasses are studied as functions of frequency (in the range 10²–10⁶ Hz) and temperature (range 30–200°C). The dielectric breakdown strength of these glasses was also determined at room temperature in an air medium. The rate of increase ofɛ and tanδ with temperature decreases with decrease in the ionic radius of RE³⁺ ion whereas the dielectric breakdown strength, the activation energy for a.c. conduction in the high temperature region decreases with increase in the ionic radius of RE³⁺ ion. An attempt has been made to explain the a.c. conduction in these glasses on the basis of quantum mechanical tunnelling (QMT) model.

A V Ravi Kumar^{1 2} B Apparao^{1 2} N Veeraiah^{1 3}

1. Department of Physics, Nagarjuna University PG Centre, Nuzvid - 521 201, India
2. Department of Physics, Andhra Loyola College, Vijayawada - 520 008, India
3. Department of Physics, P.G. College of Science, Saifabda, Osmania University, Hyderabad - 500 007, India

Published

August 1998

Manuscript received

30 March 1998

Manuscript revised

20 May 1998