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Impact of Mn2+-Si4+ co-substitution on the electronic structure of Zn0.3Mn0.7Fe2O4 ferrites studied by X-ray photoelectron spectroscopy

Authors
Jani, Komal K.Raval, Pooja Y.Vasoya, Nimish H.Nehra, MonikaSingh, MamrajJakhar, NarendraKumar, SandeepModi, Kunal B.Lim, Dong-KwonSinghal, Rishi Kumar
Issue Date
1-11월-2022
Publisher
ELSEVIER SCI LTD
Keywords
Spinel ferrite; Electronic structure; X-ray photoelectron spectroscopy
Citation
CERAMICS INTERNATIONAL, v.48, no.21, pp.31843 - 31849
Indexed
SCIE
SCOPUS
Journal Title
CERAMICS INTERNATIONAL
Volume
48
Number
21
Start Page
31843
End Page
31849
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/145456
DOI
10.1016/j.ceramint.2022.07.116
ISSN
0272-8842
Abstract
X-ray photoelectron spectroscopy (XPS) has been employed to explore the electronic structure of Zn0.3Mn0.7+xSixFe2-2xO4 (x = 0.0-0.3) ferrite series. The Si2p XPS spectra insinuated the presence of Si ions in the +4 valence state. The elemental Si-0 and suboxide SiOx are present in the system, the former showing an increase and the latter a decrease in atomic percentage upon Mn-Si substitution. It is also inferred that a fraction of Si-0 might be residing at the grain boundaries; however, more studies are required to substantiate this. The Fe2p XPS spectra stipulate that ferrous and ferric ions co-occur in the system. The ferrous ions occupy the octahedral sites while the ferric ions dwell on both the octahedral and the tetrahedral sites. The O1s spectra indicate a remarkable increase in the oxygen defects with increasing Mn-Si substitution (x). The Mn2p XPS data indicate that the Mn+2 states show an overall increasing tendency with increasing Mn-Si concentration. Also, the Mn+4/Mn+3 ratio shows an increment with an increase in Mn-Si substitution.
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