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Effect of Cr doping on the ac electrical properties of MgAl2O4 nanoparticles

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Abstract

Magnesium aluminate nanoparticles with different chromium concentration (0–12%) have been synthesized by a citrate–nitrate sol–gel route. X-ray diffraction studies confirmed the formation of single-phase cubic spinel structure excluding the presence of any secondary phase. Crystallite size of the synthesized nanoparticles was found to increase from 8.5 to 19.8 nm with the increase in Cr concentration. Fourier transformed infrared spectroscopic studies confirmed the presence of AlO6 group which led to the formation of MgAl2O4 spinel structure. Surface morphology of the sintered pellets was investigated with the help of a field emission scanning electron microscope which revealed the existence of both grain and grain boundary along with their aggregates. The dielectric constant, dielectric loss and ac conductivity were studied as a function of frequency of the applied electric field for different composition and their nature of variation with frequency has been elucidated on the basis of Maxwell–Wagner interfacial model. Impedance spectroscopy technique has been used to study the effect of grain and grain boundary on the electrical properties of this spinel oxide. All the electrical parameters showed strong dependence on the nanostructural properties and were found to vary consistently with the increase of doping concentration.

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Acknowledgment

Authors are grateful to the Department of Science and Technology (DST), the Government of India for providing financial assistance. The authors are also grateful to the University Grants Commission, the Govt. of India for support under the ‘University with potential for excellence’ scheme.

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Authors and Affiliations

  1. School of Materials Science and Nanotechnology, Jadavpur University, Kolkata, 700032, India

    Subhajit Saha, Bhaskar Das, Nilesh Mazumder, Anurag Bharati & Kalyan Kumar Chattopadhyay

  2. Department of Physics, Jadavpur University, Kolkata, 700032, India

    Kalyan Kumar Chattopadhyay

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  1. Subhajit Saha
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  2. Bhaskar Das
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  3. Nilesh Mazumder
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  4. Anurag Bharati
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  5. Kalyan Kumar Chattopadhyay
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Correspondence to Kalyan Kumar Chattopadhyay.

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Saha, S., Das, B., Mazumder, N. et al. Effect of Cr doping on the ac electrical properties of MgAl2O4 nanoparticles. J Sol-Gel Sci Technol 61, 518–526 (2012). https://doi.org/10.1007/s10971-011-2654-x

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  • DOI: https://doi.org/10.1007/s10971-011-2654-x

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