Structural, vibrational, magnetic, and X-ray absorption study on (Li, Zn)-doped NiO nanoparticles

Nanoparticles of Li- and Zn-doped NiO with Ni 1- x Li x O ( x  = 0.01, 0.03, and 0.05) and Ni 1- x Zn x O ( x  = 0.01, 0.03, 0.05 and 0.10) have been prepared by a sol–gel process. No impurity phases were found from the XRD. The average crystallite size was 10–12 nm for Li and 9–12 nm for Zn-doped N...

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Published in:Journal of materials science. Materials in electronics 2024-08, Vol.35 (23), p.1571, Article 1571
Main Authors: Das, Rajat Kumar, Otta, Sasmita, Kumar, Jagadish, Kand, Laxman, Nayak, Maheswar, Ahlawat, Anju, Behera, Bhasker Chandra, Kisan, Bhagaban
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crystal defects
Crystallites
Ferromagnetism
Magnetization
Materials Science
Nanoparticles
Nickel oxides
Optical and Electronic Materials
Sol-gel processes
Valence
X ray absorption
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Summary:Nanoparticles of Li- and Zn-doped NiO with Ni 1- x Li x O ( x  = 0.01, 0.03, and 0.05) and Ni 1- x Zn x O ( x  = 0.01, 0.03, 0.05 and 0.10) have been prepared by a sol–gel process. No impurity phases were found from the XRD. The average crystallite size was 10–12 nm for Li and 9–12 nm for Zn-doped NiO, respectively, from the Williamson Hall plot method. The Li-doped sample shows large magnetization 8.33 emu/g for x  = 0.03 and 2 emu/g for x  = 0.03 for Zn-doped NiO. The highest magnetization found in Li-doped NiO could be the creation of a large defect by doping with a monovalent dopant atom. XPS study shows the presence of Ni 3+ and Ni 2+ mixed valence states both in the doped sample. Further, nickel vacancies in Ni L 2,3 and hole state in the O K-edge were observed in both the doped samples from XAS measurement. The primary source of large ferromagnetism in doped NiO may be the large defect and presence of Ni 3+ state in the doped NiO and these materials are useful for spintronic applications.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-024-13311-y