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The polycrystalline sample of a double perovskite, Sm2NiMnO6 was synthesized by a solid-state reaction route. From the X-ray structural study, it is found that the structure of the material is monoclinic with lattice parameters: a = 4.1750(63) Å, b = 7.6113(63) Å, c = 5.9896(63) Å, and β = 112.70°. These parameters are very close to and consistent with those of such type of materials. The dielectric, impedance, AC conductivity, and electrical modulus properties of the sample were studied in the temperature range of 25-300 ℃ and the frequency range of 1 kHz-1 MHz. Typical relaxor behavior observed in the dielectric studies was confirmed by Vogel-Fulcher fitting. From the Nyquist plots, the temperature dependent contribution of grain and grain boundary effect was confirmed. The non-Debye type of relaxation was found using the complex impedance spectroscopy. The magnetic study revealed that the sample had paramagnetic behavior at room temperature. Magneto-electric (ME) coefficient was obtained by changing DC bias magnetic field. This type of lead-free relaxor ferroelectric compound may be useful for high-temperature applications.


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Dielectric relaxation and magneto-electric characteristics of lead-free double perovskite: Sm2NiMnO6

Show Author's information Rutuparna DAS( )R. N. P. CHOUDHARY
Department of Physics, Siksha 'O’ Anusandhan University, Bhubaneswar 751030, India

Abstract

The polycrystalline sample of a double perovskite, Sm2NiMnO6 was synthesized by a solid-state reaction route. From the X-ray structural study, it is found that the structure of the material is monoclinic with lattice parameters: a = 4.1750(63) Å, b = 7.6113(63) Å, c = 5.9896(63) Å, and β = 112.70°. These parameters are very close to and consistent with those of such type of materials. The dielectric, impedance, AC conductivity, and electrical modulus properties of the sample were studied in the temperature range of 25-300 ℃ and the frequency range of 1 kHz-1 MHz. Typical relaxor behavior observed in the dielectric studies was confirmed by Vogel-Fulcher fitting. From the Nyquist plots, the temperature dependent contribution of grain and grain boundary effect was confirmed. The non-Debye type of relaxation was found using the complex impedance spectroscopy. The magnetic study revealed that the sample had paramagnetic behavior at room temperature. Magneto-electric (ME) coefficient was obtained by changing DC bias magnetic field. This type of lead-free relaxor ferroelectric compound may be useful for high-temperature applications.

Keywords:

solid-state reaction, X-ray diffraction (XRD), dielectric relaxation, magneto-electric (ME) coupling
Received: 09 June 2018 Revised: 05 November 2018 Accepted: 08 November 2018 Published: 13 June 2019 Issue date: June 2019
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Publication history
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Publication history

Received: 09 June 2018
Revised: 05 November 2018
Accepted: 08 November 2018
Published: 13 June 2019
Issue date: June 2019

Copyright

© The author(s) 2019

Acknowledgements

The authors would like to extend their gratitudes and sincere thanks to Dr. Kalyani Mohanta, Indian Institute of Technology, BHU, for providing some experimental facilities for microstructure and Dr. Perumal Alagarsamy, Indian Institute of Technology, Guwahati, providing the experimental facility for magnetic measurements.

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