Enhanced iron magnetic moment in the ThFe11C2 intermetallic compound

International audienceDetailed theoretical investigations on the electronic and magnetic properties of the ThFe11C2 compound have been performed using both the linear muffin-tin orbital and Korringa-Kohn-Rostocker methods of band structure calculation. The structure of the ThFe11C2 compound has three inequivalent iron sites with different local environment. A strongly enhanced magnetic moment is observed on certain Fe positions, coexisting with much lower magnetic moments on other iron positions of the lattice. Band structure calculations indeed show that the Fe magnetic moments depend strongly on the local environment. The average Fe magnetic moment obtained from these calculations is in good agreement with the experimental average Fe moment obtained from magnetization measurements. The orbital contribution to the magnetic moment is found to be especially large on the Fe 4b position. Comparing calculated hyperfine fields with experimental results, it is found that the calculated and experimental hyperfine fields are correlated. However, similarly to the results reported before for elemental Fe, the magnitude of all calculated Fe hyperfine fields is about 25% smaller. The agreement with the Mössbauer measurements is improved by scaling the core polarization contribution and by estimating the orbital valence d-electrons contribution to the magnetic hyperfine fields using the local spin density approximation + dynamical mean field theory calculated orbital moments

Collagen scaffold and lipoaspirate fluid - Derived stem cells for the treatment of cartilage defects in a Rabbit Model

The purpose of the present study was to assess and compare the chondroregenerative properties of PLA (processed lipoaspirate) and LAF (lipoaspirate fluid) cells, in a preclinical rabbit model of knee cartilage defect. The defects were repaired by a collagen I/III scaffold and added LAF-cells, PLA-cells or no cells, upon the study group. The results showed that collagen scaffolds seeded with LAF-derived stem cells appear to have slightly better activity and outcomes when compared to PLA-cells, in terms of cartilage regeneration

Erratum to: Comparative assessment of image quality for coronary CT angiography with iobitridol and two contrast agents with higher iodine concentrations: iopromide and iomeprol. A multicentre randomized double-blind trial

Unfortunately, there is amistake in the section Results, Clinical safety. While the text states that “no severe AEs were reported”, in fact one severe AE was reported in the iomeprol group (one severe injection site pain assessed as possibly related to contrast agent), as shown in Table 5. In addition, the name of the author Jean-François Paul was rendered incorrectly in the original publication but has since been corrected. The authors apologize for these mistakes

Electronic structure and magnetic properties of the Fe16N2 doped with Ti

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Cross over between ferro and antiferromagnetic order in Fe itinerant electron magnetism: An experimental and theoretical study of the model (Hf,Ta)Fe 2 Laves phases

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Neutron diffraction study of the itinerant-electron metamagnetic Hf0.825Ta0.175Fe2 compound

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Influence of particles size on the morphology and corrosion behaviour of phenol-formaldehyde/Zn composite coatings obtained by electrodeposition

International audienceThe present work has the purpose of studying the structure and corrosion behaviour of composite coatings having zinc as matrix, and phenol - formaldehyde resin type Novolac (RESITAL 6358/1) as dispersed phase obtained during electrodeposition process of zinc. The phenol - formaldehyde resin/Zn composite coatings were electrodeposited from a suspension of phenol - formaldehyde resin particles in aqueous zinc sulphate electrolyte by adding 10g/L of phenol formaldehyde resin particles in the electrolyte solution. Two dimensions of dispersed particles were used: 0.1 - 5 mu m and 6 - 10 mu m respectively. The surface morphologies of the coatings were investigated by scanning electron microscopy (SEM - EDS) and atomic force microscopy (AFM) methods. The pure zinc coating has a rather regular surface, whereas the composite coating surfaces have finer grains and different morphologies. The electrochemical behaviour of the coatings in the corrosive solutions was investigated by electrochemical impedance spectroscopy (EIS) method. As electrochemical test solution 0.5M sodium chloride was used in a three electrode open cell. The corrosion potential is shifted to more negative values for composite coatings than that of pure zinc coating. The polarization resistances of phenol - formaldehyde resin/Zn composite coatings are bigger than that of pure zinc coating obtained in the same condition for electrodeposition