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Article
Assessing the reactivity of Fe(II) sorbed on smectite surface towards U(VI) reduction
The reactivity of Fe(II) sorbed on clay edges towards U(VI) reduction is investigated at pH 6.0 using Fe-free synthetic montmorillonite (MONT), Fe-poor natural montmorillonite (Fe-MONT) and Fe-rich natural non...
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Article
Mössbauer spectrometry insights into the redox reactivity of Fe-bearing phases in the environment
Rates and mechanisms of important reactions in the cycling of electrons via the geochemical transformations of iron have been identified using Mössbauer spectrometry. The cycling of iron through various reserv...
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Article
Contribution of Mössbauer spectrometry to structural characterizations of iron-based fluorinated materials: Application to pyrochlore (NH4)CuFeF6 and a new derived hydrate
This paper brings together the latest studies on iron-based fluorides, anhydrous, hydrates, or hybrids, particularly composed of HTB sheets, with the help of 57Fe Mössbauer spectrometry to accurately describe the...
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Article
Open AccessTunable magnetocaloric effect in amorphous Gd-Fe-Co-Al-Si alloys
A magnetocaloric effect with wide tunability was observed in melt-spun amorphous Gd65Fe15-xCo5+xAl10Si5 (x = 0, 5, 10) alloys of different Fe/Co ratios. Their magnetic properties were compared with those of the p...
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Article
One-pot synthesis and properties of Mn-doped maghemite nanoparticles using acetylacetonate precursors
A simple one-pot synthesis was utilized to prepare Mn-doped maghemite nanoparticles. A homogenized mixture of Mn- and Fe-acetylacetonates was heated in air atmosphere at 300 °C to produce Mn-doped maghemite. X...
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Article
Open AccessOn the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe2O4-CoO core-shell nanoparticles
Hetero-nanostructures based on magnetic contrast oxides have been prepared as highly dense nanoconsolidates. Cobalt ferrite-cobalt oxide core-shell type nanoparticles (NPs) were synthesized by seed mediated gr...
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Article
Open AccessEnhancing the magnetic anisotropy of maghemite nanoparticles via the surface coordination of molecular complexes
Superparamagnetic nanoparticles are promising objects for data storage or medical applications. In the smallest—and more attractive—systems, the properties are governed by the magnetic anisotropy. Here we repo...
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Article
Grafting of diazonium salts on oxides surface: formation of aryl-O bonds on iron oxide nanoparticles
Combining ab initio modeling and 57Fe Mössbauer spectrometry, we characterized the nature of the chemical linkage of aminoalkyl arenediazonium salt on the surface of iron oxide nanoparticles. We established that ...
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Article
Thermodynamic properties of chlorite and berthierine derived from calorimetric measurements
In the context of the deep waste disposal, we have investigated the respective stabilities of two iron-bearing clay minerals: berthierine ISGS from Illinois [USA; (Al0.975FeIII0.182FeII1.422Mg0.157Li0.035Mn0.002
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Article
Exchange-biased oxide-based core–shell nanoparticles produced by seed-mediated growth in polyol
We report, for the first time, the synthesis of magnetically contrasted oxide-based core–shell nanoparticles using the polyol process. Iron oxide nanoparticles were first prepared by forced hydrolysis of iron ...
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Article
Design and Functionalization of Magnetic Core-Shell Oxide Nanoparticles Exhibiting Exchange Bias Features
Core-shell magnetic nanoparticles (CSNPs) composed of a ferrimagnetic core (CoFe2O4) embedded in an antiferromagnetic shell (CoO) were produced using seed mediated growth in a polyol. Different core sizes and she...
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Chapter
Magnetic Iron-Based Oxides Investigated by 57Fe Mössbauer Spectrometry
Oxides exhibit different structural types giving rise, especially, to a large variety of magnetic and transport properties. New synthesis routes allow obtaining new oxides in microcrystalline, nanocrystalline ...
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Article
Hyperfine fields of amorphous residual and interface phases in FeMCuB nanocrystalline alloys: a Mössbauer effect study
Amorphous and nanocrystalline Fe80M7Cu1B12 (M = Mo, Nb, Ti) alloys are investigated at room and liquid nitrogen temperatures. 57Fe Mössbauer spectrometry is employed because its local probe behaviour is able to e...
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Chapter
Mössbauer Spectrometry Applied to Iron-Based Nanocrystalline Alloys I.
Nanocrystalline alloys which are obtained after subsequent annealing of the amorphous precursor consists of nanocrystalline grains embedded within a residual amorphous matrix. Thus, they exhibit a two-phase ma...
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Chapter
Mössbauer Spectrometry Applied to Iron-Based Nanocrystalline Alloys II
During the crystallization of some amorphous alloys, Fe atoms segregate from the residual amorphous matrix into bcc—Fe crystalline grains. Consequently, the chemical and/or topological short-range order of amo...
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Article
Methodology of interfacial regions in FeMCuB‐type nanocrystals
A fitting model based on the use of two independent blocks resulting from distributions of hyperfine fields and one sextuplet of Lorentzian lines is introduced to simulate Mössbauer spectra of FeMCuB‐type nano...
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Article
ULM-12 and ULM-19: The Hydrated and Anhydrous forms of the First Synthetic Oxyfluorinated Iron Phosphate with an Open Structure
ULM-19 or [Fe4(PO4)4F2], [C6H14N2] was obtained in a monocrystalline form from the dehydration of single crystals of ULM-12, or [Fe4(PO4)4F2(H2O)3], [C6H14N2] at 260°C. It is monoclinic (S.G. P21/n) with a = 10.0...
