Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

Kumar P, R and Prasad, N and Veillon, F and Prellier, W (2020) Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method. In: Journal of Alloys and Compounds .

PDF jou_all_com_2020.pdf - Published Version Restricted to Registered users only Download (2MB) | Request a copy

Abstract

Pure and 5 mol Eu doped nickel oxide (NiO) nanoparticles were synthesized by microwave-assisted hydrothermal method. X-ray diffraction and Rietveld refinement analysis confirmed the phase and purity of prepared nanoparticles. Scanning electron microscopy analysis revealed that the undoped nanoparticles are porous flake-like structures while the doped samples were aggregated. X-ray photoelectron spectroscopy analysis disclosed that Eu doping increases hole concentration, Ni2+ vacancies, and defective oxygen concentration in the nanoparticles. The magnetic analysis shows the presence of weak ferromagnetism in lower fields of the undoped nanoparticles. On doping with Eu, the ferromagnetic behaviour increases due to increased oxygen defects and uncompensated surface spins. Raman spectroscopy investigation shows the absence of 2 M vibrational mode and reduced antiferromagnetic coupling in the prepared samples. It also substantiated the presence of defects in the prepared samples. Eu doping produced local vibrations that overlap with SO mode of NiO and shifting of 1 M band due to its higher mass. Eu dopant can modify the magnetic property of NiO nanoparticles that can be used in spintronic applications. © 2020

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	15 Mar 2021 10:11
Last Modified:	15 Mar 2021 10:11
URI:	http://eprints.iisc.ac.in/id/eprint/67467

Actions (login required)

View Item