Click here to view fulltext PDF

Permanent link:
https://www.ias.ac.in/article/fulltext/boms/020/05/0667-0675

Elastic moduli; composite oscillator; bonding defects

The elastic moduli (Y, η, σ andH) and some thermodynamical parameters, such as Debye temperatureθ_D, diffusion constantD_i and latent heat of melting ΔH_m, of ZnF₂-PbO-TeO₂ glasses doped with some rare earth (Pr³⁺, Nd³⁺, Eu³⁺ and Tb³⁺) ions are determined as functions of temperature using piezo electric composite oscillator technique. All the parameters are found to decrease with increase in the atomic number Z of the rare earth ions and with increase in the temperature of measurement. The results are explained on the basis of the density of localized bonding defect states within the band gap of the material.

V Ravi Kumar¹ N Veeraiah¹

1. Department of Physics, Nagarjuna University P. G. Centre, Nuzvid - 521 201, India

Published

August 1997

Manuscript received

7 February 1997

Manuscript revised

28 April 1997