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Electrical conductivity and dielectric relaxation studies on microwave synthesized Na2SO4·NaPO3·MoO3 glasses

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Abstract

Electrical conductivity and dielectric relaxation studies on SO4 2− doped modified molybdo-phosphate glasses have been carried out over a wide range of composition, temperature and frequency. The d.c. conductivities which have been measured by both digital electrometer (four-probe method) and impedance analyser are comparable. The relaxation phenomenon has been rationalized using electrical modulus formalism. The use of modulus representation in dielectric relaxation studies has inherent advantages viz., experimental errors arising from the contributions of electrode-electrolyte interface capacitances are minimized. The relaxation observed in the present study is non-Debye type. The activation energies for relaxation were determined using imaginary parts of electrical modulus peaks which were close to those of the d.c. conductivity implying the involvement of similar energy barriers in both the processes. The enhanced conductivity in these glasses can be attributed to the migration of Na+, in expanded structures due to the introduction of SO4 2− ions.

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Acknowledgments

The authors are grateful to Prof. K J Rao, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, for providing computational facility and many insightful discussions.

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Authors and Affiliations

  1. Department of Electronics and Communication, MSR Institute of Technology, Bangalore, 560054, India

    B. Sujatha

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

    R. Viswanatha & B. K. Chethana

  3. Department of Physics, Tumkur University, Tumkur, 572103, India

    H. Nagabhushana

  4. Department of Physics, Sree Siddaganga College of Arts, Science and Commerce, B H Road, Tumkur, 572102, India

    C. Narayana Reddy

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  1. B. Sujatha
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  2. R. Viswanatha
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Correspondence to C. Narayana Reddy.

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Sujatha, B., Viswanatha, R., Chethana, B.K. et al. Electrical conductivity and dielectric relaxation studies on microwave synthesized Na2SO4·NaPO3·MoO3 glasses. Ionics 22, 563–571 (2016). https://doi.org/10.1007/s11581-015-1580-2

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