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N Veeraiah
Articles written in Bulletin of Materials Science
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Volume 20 Issue 5 August 1997 pp 667-675
Elastic properties of ZnF2-PbO-TeO2 glasses doped with certain rare earth ions
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. -
Volume 21 Issue 4 August 1998 pp 341-347 Electrical Properties
Dielectric properties of LiF-B2O3 glasses doped with certain rare earth ions
A V Ravi Kumar B Apparao N Veeraiah
Dielectric constant
ɛ , 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.
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Bulletin of Materials Science
Volume 45, 2022
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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