Correlation of electronic structure and magnetic properties of Ce1-xSmxO2 nanostructure using synchrotron soft XAS

Soni, S and Kabra, K and Sahu, J and Prakash Dubey, D and Dalela, B and Alvi, PA and Kumar, S and Gupta, M and Dalela, S (2024) Correlation of electronic structure and magnetic properties of Ce1-xSmxO2 nanostructure using synchrotron soft XAS. In: Journal of Magnetism and Magnetic Materials, 596 .

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Abstract

The present study reports crystalline structure, electronic structure and magnetic properties for nanoparticles undoped CeO2 and Ce1-xSmxO2 (x = 0.02 to 0.10, @ 0.02). The nanoparticle samples are synthesized by the co-precipitation method. XRD data shows the successful incorporation of Sm3+ ions at Ce4+ sites in the face-centered cubic (fcc) lattice. The soft X-ray absorption spectroscopy technique is utilized to get an insightful overview of electronic structural properties due to structural defects, chemical states and the development of oxygen vacancies in Ce1-xSmxO2 nanoparticles. The soft XAS spectra show a significant Ce and Sm peak in the M4,5 domain, along with the well-defined O K-edge peak. Analysis of Ce M4,5-edges indicates that Ce-ions have both 3 + and 4 + oxidation states. With the incorporation of Sm+3 ions, there is a reduction of Ce4+ states and oxidation of Ce3+ states, as well as a substantial increase in oxygen vacancy concentration. The room-temperature magnetic properties of Ce1-xSmxO2 nanoparticles reveal ferromagnetic behavior. The origin of ferromagnetism is explained by F-center exchange (FCE) coupling mechanisms mediated via development of oxygen vacancy and defects. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Magnetism and Magnetic Materials
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Cerium oxide; Electronic structure; Ferromagnetism; Ions; Magnetic properties; Nanomagnetics; Nanoparticles; Precipitation (chemical); Structural properties; Synthesis (chemical); X ray absorption spectroscopy, Electronic.structure; Exchange mechanism; F-center exchange mechanism; F-center exchanges; Magnetic oxides; Oxygen vacancy (Vo); Soft-X-ray absorption; SQUID measurements; X-ray absorption spectroscopy, Oxygen vacancies
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	24 May 2024 10:53
Last Modified:	24 May 2024 10:53
URI:	https://eprints.iisc.ac.in/id/eprint/84782

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