Dwivedi, G.
, Kumawat, S.
, Chin, Y.
, Lynn, J.
and Chou, H.
(2024),
Role of p-d Hybridization in Structural Transition and Magnetic Properties of Co-substituted Mn3O4: X-ray Absorption Spectroscopy Study, Journal of Alloys and Compounds, [online], https://doi.org/10.1016/j.jallcom.2024.173651, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956986
(Accessed April 27, 2024)
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Role of p-d Hybridization in Structural Transition and Magnetic Properties of Co-substituted Mn3O4: X-ray Absorption Spectroscopy Study
Published
Author(s)
G. Dwivedi, S.M. Kumawat, Y.Y. Chin, ,
Abstract
This work investigates the role of p-d orbital hybridization in the structural transition from tetragonal I41/amd to cubic Fd3 ̅m and enhancement in Néel temperature (TN) from 43K to 175K in Co-substituted (Mn1-xCox)3O4 (where x = 0.0, 0.1, 0.2, 0.3, 0.5, and 0.6). X-ray absorption spectra of Co-L2,3 and Mn-L2,3 edges show that the high-spin Co2+ cations initially substitute the Mn2+ at the tetrahedral-sites. When the tetrahedral-sites are fully occupied, then the high-spin Co3+ cations begin to occupy the octahedral-site. The substitution of Co cations at both the tetrahedral and octahedral-sites increases the bond angle between adjacent tetrahedral and octahedral site cations via O-2p orbitals, suppressing the orbital instability of Mn3+ cations. These effects dramatically enhance the superexchange interaction and hence the TN.Citation
Journal of Alloys and Compounds
Volume
981
Pub Type
Journals
Download Paper
Keywords
Spinel material, Geometric Frustration, Doping Effect
Citation
Created February 8, 2024, Updated March 13, 2024