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Title: Structural, dielectric and magnetic properties of double perovskite-La2CoNiO6 ceramics synthesised by wet chemical route

Authors: Jashandeep Singh; Amit Kumar; Uttam Kumar Goutam; Ram Janay Choudhary; Ashok Kumar

Addresses: Department of Physics, National Institute of Technology, Kurukshetra, Haryana 136119, India ' Department of Physics, National Institute of Technology, Kurukshetra, Haryana 136119, India; School of Material Science and Nanotechnology, National Institute of Technology, Kurukshetra 136119, India ' Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India ' UGC-DAE Consortium for Scientific Research Indore Centre, Indore, 452017, India ' Department of Physics, National Institute of Technology, Kurukshetra, Haryana 136119, India; Department of Applied Sciences, National Institute of Technical Teachers Training and Research, Chandigarh 160019, India

Abstract: The polycrystalline double perovskite-La2CoNiO6 ceramics were successfully synthesised by facile wet chemical route. The X-ray diffraction pattern has confirmed the formation of rhombohedral phase with R3c symmetry and calculated value of lattice parameters as, a = b = 5.64 Å and c =13.25 Å, respectively. The presence of La3+ ions, Co2+/Co3+ ions, and Ni2+ ions on the surface of La2CoNiO6 has been exhibited via X-ray photoelectron spectroscopy. The temperature and frequency dependent dielectric and impedance analysis has revealed the effect of grains and grain boundaries in the relaxation process. The observed values of ac conductivity varied from 5.27 × 10−6 S/m to 1.06 × 10−5 S/m with variation of temperature from 300 K to 473 K at frequency of 1 kHz. Further, La2CoNiO6 is a new ferromagnetic semiconductor exhibiting spin glass transition at low temperature of ~50 K. The present first report on structural, dielectric and magnetic study makes La2CoNiO6 a promising material for electronic devices applications.

Keywords: double perovskites; oxides; wet chemical; ceramics; magnetic; dielectric.

DOI: 10.1504/IJNT.2021.116178

International Journal of Nanotechnology, 2021 Vol.18 No.5/6/7/8, pp.622 - 637

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 21 Jun 2021 *

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