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Complex Dielectric, Impedance, and Electric Modulus of CuMn2O4

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Abstract

Tetragonal distorted CuMn2O4 spinel has been prepared by a single-step method and its complex dielectric, impedance, and electric modulus measured with respect to frequency at different selected temperatures. In all the measurements, a frequency-dependent inflection point was observed above 170 K, revealing the cross-over in the grain and grain boundary effects in the electrical properties. Therefore, the activation energy was calculated to be \( E_{\rm{a}} \approx 0.27\,{\hbox{eV}} \) from the dielectric loss but as \( E_{\rm{a}} \approx 0.2\,{\hbox{eV}} \) from the impedance and electric modulus based on the Arrhenius nature of the relaxation time. Further, alternating-current (AC) conductivity measurements in the frequency range from 100 Hz to 1 MHz suggested hoping conduction due to small polarons.

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Acknowledgments

I. Naik, S. Mohanta, and P. Patra acknowledge the UGC-DAE Consortium for Scientific Research, Mumbai Centre for the experimental facility under the collaborative research project scheme (CRS-M-229).

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Authors and Affiliations

  1. Department of Physics, North Orissa University, Baripada, 757003, India

    S. Mohanta, I. Naik & P. Patra

  2. UGC-DAE Consortium for Scientific Research Mumbai Centre, BARC, Trombay, Mumbai, 400085, India

    S. D. Kaushik & S. Mukherjee

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  1. S. Mohanta
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  2. I. Naik
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  3. S. D. Kaushik
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  4. S. Mukherjee
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  5. P. Patra
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Correspondence to I. Naik.

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Mohanta, S., Naik, I., Kaushik, S.D. et al. Complex Dielectric, Impedance, and Electric Modulus of CuMn2O4. J. Electron. Mater. 49, 842–847 (2020). https://doi.org/10.1007/s11664-019-07698-2

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  • DOI: https://doi.org/10.1007/s11664-019-07698-2

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