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Conductivity studies on microwave synthesized glasses

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Abstract

Conductivity measurements have been made on x V 2O5 − (100−x) [0.5 Na2O + 0.5 B2O3] (where 10 ≤ x ≤ 50) glasses prepared by using microwave method. DC conductivity (σ) measurements exhibit temperature-and compositional-dependent trends. It has been found that conductivity in these glasses changes from the predominantly ‘ionic’ to predominantly ‘electronic’ depending upon the chemical composition. The dc conductivity passes through a deep minimum, which is attributed to network disruption. Also, this nonlinear variation in σ dc and activation energy can be interpreted using ion–polaron correlation effect. Electron paramagnetic resonance (EPR) and impedance spectroscopic techniques have been used to elucidate the nature of conduction mechanism. The EPR spectra reveals, in least modified (25 Na2O mol%) glasses, conduction is due to the transfer of electrons via aliovalent vanadium sites, while in highly modified (45 Na2O mol%) glasses Na+ ion transport dominates the electrical conduction. For highly modified glasses, frequency-dependent conductivity has been analysed using electrical modulus formalism and the observations have been discussed.

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Acknowledgements

We are grateful to Professor KJ Rao, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, for his encouragement and many helpful discussions. We also thank Jain University, Bangalore, for providing financial assistance to carry out this work.

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Authors and Affiliations

  1. Department of Physics, School of Graduate Studies, Jain University, Bangalore, 560027, India

    ASHA RAJIV, M SUDHAKARA REDDY & JAYAGOPAL UCHIL

  2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India

    R VISWANATHA

  3. Department of Physics, Sree Siddaganga College of Arts, Science and Commerce, Tumkur University, Tumkur, 572103, India

    C NARAYANA REDDY

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  1. ASHA RAJIV
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Correspondence to C NARAYANA REDDY.

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RAJIV, A., REDDY, M.S., VISWANATHA, R. et al. Conductivity studies on microwave synthesized glasses. Bull Mater Sci 38, 985–993 (2015). https://doi.org/10.1007/s12034-015-0958-0

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