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Effect of Particle Size on Magnetic and Dielectric Properties of Nanoscale Dy-Doped BiFeO3

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Abstract

In the present report, influence of Dy-substitution and size on the structural, magnetic and dielectric properties of BiFeO3 nanoparticles has been investigated. The synthesis of pure and Dy-doped BiFeO3 nanoparticles has been done successfully using sol–gel method. Size of Dy-doped BiFeO3 nanoparticles was tailored by varying the calcination temperature. Structural analysis reveal that substitution of Dy3+ leads to a change in structure from rhombohedral (x=0) to orthorhombic (x=0.15). The average crystallite size varies from 6 to 15 nm. Magnetic study reveals the enhancement in magnetization with the doping of Dy3+. Further, this value decreases as the particle size increases. Dielectric property improves with the Dy3+ substitution. All the nanoparticles display Debye-type relaxation. The low dielectric loss values observed are attributed to the nanosized grains. Remarkably, enhanced saturation magnetization value (13.8 emu/g) and dielectric constant value (95.8) were observed for Dy-doped BiFeO3 nanoparticles having the smallest particle size. Thereby, the study indicates strong correlation between size and multiferroism.

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Acknowledgements

This research work is supported by Government of India, Department of Atomic Energy (DAE), Board of Research in Nuclear Sciences (BRNS) vide sanction No. 2012/37P/48/BRNS.

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Authors and Affiliations

  1. Nano Research Lab, School of Physics and Materials Science, Thapar University, Patiala, 147 004, India

    Gitanjali Dhir, Poonam Uniyal & N. K. Verma

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  1. Gitanjali Dhir
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  2. Poonam Uniyal
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  3. N. K. Verma
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Correspondence to Gitanjali Dhir.

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Dhir, G., Uniyal, P. & Verma, N.K. Effect of Particle Size on Magnetic and Dielectric Properties of Nanoscale Dy-Doped BiFeO3 . J Supercond Nov Magn 27, 1569–1577 (2014). https://doi.org/10.1007/s10948-014-2480-9

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  • DOI: https://doi.org/10.1007/s10948-014-2480-9

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