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3. Silicon-Doped Nanostructured Fe80Ni20 Alloys: The Role of Si on the Microstructure, Morphology and Magnetic Properties

Author

Ourihane, Hafida, Guittoum, Abderrahim, Hemmous, Messaoud, Martínez-Blanco, David, Blanco, Jesus Angel, Gorria, Pedro, and Boukherroub, Nadia

Abstract

Fe(Ni, Si) solid solutions were elaborated by high energy mechanical alloying from elemental Fe, Ni and Si powdersfor a milling time of 72 h. From X-ray diffraction (XRD) analysis, it has been shown that the Fe(Ni, Si) samples present a single phase in the whole range of Si content and exhibit a solid solution of disordered bcc α-Fe. The lattice parameter a (Å) of the new structures and the mean crystallitessize <D> (nm) were found to decrease with increasing Si contents. In contrast, the microstrain behaviour presents two different stages as the Si contents are increased. Scanning Electron Microscopy (SEM) images confirmed the behaviour of the mean crystallites size, where it can be seen that the addition of Si promotes the reduction of the size of powder particles. The saturation magnetization Ms was found to decrease by a factor of almost 1.4 and the coercively was found to increase by a factor of almost 2.4, when the Si content was increased from x= 0 % to x= 20 %. The Mössbauer spectroscopy confirmed the local in site crystal locations of Si and Ni as they diffuse into the matrix of the bcc α-Fe structure to form a solid solution.

Published
2022
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4. Canciones tradicionales españolas

Author

Martinez Blanco, Jesús Ángel and Martinez Blanco, Jesús Ángel

Subjects
Popular music--Spain, Songs, Spanish
Published
2011

8. ChemInform Abstract: 4′-N-Methyl-5′-hydroxystaurosporine and 5′-Hydroxystaurosporine, New Indolocarbazole Alkaloids from a Marine Micromonospora sp. Strain.

Author

Canedo Hernandez, Librada M., primary, de la Fuente Blanco, Jesus Angel, additional, Perez Baz, Julia, additional, Fernandez Puentes, Jose L., additional, Romero Millan, Francisco, additional, Espliego Vazquez, Fernando, additional, Fernandez-Chimeno, Rosa Isabel, additional, and Garcia Gravalos, Dolores, additional

Published
2001
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9. Chiral Properties of BiFeO3 Inferred from Resonant X-ray Bragg Diffraction.

Author

Rodriguez-Fernandez, Angel, Lovesey, Stephen William, Collins, Stephen Patrick, Nisbet, Gareth, and Blanco, Jesus Angel

Abstract

A new chiral phase of ferric ions in bismuth ferrite (BiFeO3), the only material known to support multiferroic behaviour at room temperature, is inferred from extensive sets of data gathered by resonant x-ray diffraction. Values of all ferric multipoles participating in a minimal model of Fe electronic structure are deduced from azimuthal-angle scans. Paramagnetic (700 K) and magnetically ordered (300 K) phases of a single crystal of BiFeO3 have been studied with x-rays tuned near to the iron K-edge (7.1135 keV). At both temperatures, intensities at a Bragg spot forbidden in the nominal space-group, R3c, are consistent with a chiral motif of ferric ions in a circular cycloid propagating along (1, 1, 0)H. Templeton and Templeton scattering at 700K is attributed in part to charge-like quadrupoles in a cycloid. The contribution is not present in a standard, simplified model of electronic states of the resonant ion with trivial cylindrical symmetry. [ABSTRACT FROM AUTHOR]

Published
2014
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