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Dielectric relaxation of samarium aluminate

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Abstract

A ceramic SmAlO3 (SAO) sample is synthesized by the solid-state reaction technique. The Rietveld refinement of the X-ray diffraction pattern has been done to find the crystal symmetry of the sample at room temperature. An impedance spectroscopy study of the sample has been performed in the frequency range from 50 Hz to 1 MHz and in the temperature range from 313 K to 573 K. Dielectric relaxation peaks are observed in the imaginary parts of the spectra. The Cole–Cole model is used to analyze the dielectric relaxation mechanism in SAO. The temperature-dependent relaxation times are found to obey the Arrhenius law having an activation energy of 0.29 eV, which indicates that polaron hopping is responsible for conduction or dielectric relaxation in this material. The complex impedance plane plot of the sample indicates the presence of both grain and grain-boundary effects and is analyzed by an electrical equivalent circuit consisting of a resistance and a constant-phase element. The frequency-dependent conductivity spectra follow a double-power law due to the presence of two plateaus.

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Acknowledgements

APS acknowledges the Department of Science and Technology for providing financial support through an Inspire Fellowship. Alo Dutta thanks the Department of Science and Technology, Government of India, New Delhi for providing financial support through the DST Fast Track Project under Grant No. SR/FTP/PS-032/2010.

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Authors and Affiliations

  1. Department of Physics, Bose Institute, 93/1, APC Road, Kolkata, 700 009, India

    Anup Pradhan Sakhya, Alo Dutta & T. P. Sinha

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  1. Anup Pradhan Sakhya
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  2. Alo Dutta
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  3. T. P. Sinha
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Correspondence to Anup Pradhan Sakhya.

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Sakhya, A.P., Dutta, A. & Sinha, T.P. Dielectric relaxation of samarium aluminate. Appl. Phys. A 114, 1097–1104 (2014). https://doi.org/10.1007/s00339-013-7766-4

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