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Published on: August 16, 2021
Magnetism of nanostructured hematite: from cultural heritage to fundamental properties
Sawssen Slimani1,2, Alberto Martinelli3, Alexander Omelyanchik1
1Department of Chemistry and Industrial Chemistry & INSTM RU, University of Genoa, Via Dodecaneso 31, Genoa, I-16146, Italy. Sawssen.Slimani@edu.unige.it.
Abstract:
This study presents a comprehensive magnetic and morpho-structural investigation of α-Fe2O3 nanostructures from two distinct origins: natural (geologically extracted) and synthesized (i.e., laboratory-synthesized by an auto-combustion sol-gel method and commercially purchased hematite). All samples underwent thermal treatments, designed to reproduce color changes typical of hematite pigments in archaeological contexts. Through a combination of DC magnetization measurements and Mössbauer spectroscopy, we demonstrated the possibility of differentiating the origin of hematite nanostructures based on their magnetic behavior. Interestingly, low-temperature NPD analysis revealed that the intensity of the magnetic peak (003) was partially suppressed but not completely extinguished as expected for a perfect antiferromagnetic alignment, which suggests a possible coexistence of weakly ferromagnetic and antiferromagnetic phases in distinct domains below the Morin transition.
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