Mössbauer Spectroscopy (MS) has established itself as a very powerful technique, being able to provide chemical, structural and magnetic information on a wide variety of materials. In such perspective, this technique is used in a broad range of research areas, (e.g. Chemistry, Physics, Biology, Geology, Materials Science) for both fundamental and industrial applications. The present communication, by shortly discussing several examples, will show how MS on condensed matter opens interesting opportunities and perspectives in the research area of Materials Physical Chemistry, with particular attention to the nanostructured magnetic materials. MS probes the effects of hyperfine interactions between the nucleus and the surrounding environment. In fact, even if the energy contribution due to hyperfine effects is very low, this technique allows to detect them thanks to its very high energy resolution (e.g. ΔE ~ 10-9 eV for the 57Fe I= 1/2 → 3/2 14.4 keV nuclear transition). In this regard MS allows a quantitative evaluation of Iron Fe3+ an Fe2+, which often represents a tricky issue in several systems. Taking as a case study nanostructured spinel iron oxide, the longstanding distinction among magnetite (Fe3O4) and maghemite (γ-Fe2O3) will be discussed, showing how MS can give a resolutive contribution in this scientific debate. The extraordinary sensitivity in investigating hyperfine interactions also allows the study of interface between different materials, as demonstrated in the SrFe12O19/CoFe2O4 system, where MS makes it possible to identify the crystallographic sites at which the interface iron atoms are located. In studying nanostructured magnetic materials, the very short experimental time windows (tw = 5×10-9 s) of MS allows a careful investigation of the magnetization dynamics revealing interesting features, such as super spin-glass regime. Moreover, Mössbauer spectroscopy under intense magnetic field (MSHF) allows even to investigate magnetic structure of such class of materials: using nanostructured spinel ferrites as a model system it is possible to evaluate how the interplay among inversion degree and surface magnetic disorder (i.e. spin canting) affects the magnetic properties. Finally, the perspectives related to the use of 57Fe-enriched nano-heterostructures in order to increase Mössbauer sensitivity will be discussed.
Mössbauer Spectroscopy: Opportunities and Perspectives for Materials Science
Slimani S.;Ramzan A.;Maltoni P.;Omelyanchik A.;Abdolrahimi M.;Laureti S.;Varvaro G.;Peddis D.
2026-01-01
Abstract
Mössbauer Spectroscopy (MS) has established itself as a very powerful technique, being able to provide chemical, structural and magnetic information on a wide variety of materials. In such perspective, this technique is used in a broad range of research areas, (e.g. Chemistry, Physics, Biology, Geology, Materials Science) for both fundamental and industrial applications. The present communication, by shortly discussing several examples, will show how MS on condensed matter opens interesting opportunities and perspectives in the research area of Materials Physical Chemistry, with particular attention to the nanostructured magnetic materials. MS probes the effects of hyperfine interactions between the nucleus and the surrounding environment. In fact, even if the energy contribution due to hyperfine effects is very low, this technique allows to detect them thanks to its very high energy resolution (e.g. ΔE ~ 10-9 eV for the 57Fe I= 1/2 → 3/2 14.4 keV nuclear transition). In this regard MS allows a quantitative evaluation of Iron Fe3+ an Fe2+, which often represents a tricky issue in several systems. Taking as a case study nanostructured spinel iron oxide, the longstanding distinction among magnetite (Fe3O4) and maghemite (γ-Fe2O3) will be discussed, showing how MS can give a resolutive contribution in this scientific debate. The extraordinary sensitivity in investigating hyperfine interactions also allows the study of interface between different materials, as demonstrated in the SrFe12O19/CoFe2O4 system, where MS makes it possible to identify the crystallographic sites at which the interface iron atoms are located. In studying nanostructured magnetic materials, the very short experimental time windows (tw = 5×10-9 s) of MS allows a careful investigation of the magnetization dynamics revealing interesting features, such as super spin-glass regime. Moreover, Mössbauer spectroscopy under intense magnetic field (MSHF) allows even to investigate magnetic structure of such class of materials: using nanostructured spinel ferrites as a model system it is possible to evaluate how the interplay among inversion degree and surface magnetic disorder (i.e. spin canting) affects the magnetic properties. Finally, the perspectives related to the use of 57Fe-enriched nano-heterostructures in order to increase Mössbauer sensitivity will be discussed.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
