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Träfflista för sökning "WFRF:(Dmitriev V) srt2:(2005-2009)"

Sökning: WFRF:(Dmitriev V) > (2005-2009)

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  • Dubrovinskaia, N., et al. (författare)
  • Beating the miscibility barrier between iron group elements and magnesium by high-pressure alloying
  • 2005
  • Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 95:24
  • Tidskriftsartikel (refereegranskat)abstract
    • Iron and magnesium are almost immiscible at ambient pressure. The low solubility of Mg in Fe is due to a very large size mismatch between the alloy components. However, the compressibility of Mg is much higher than that of Fe, and therefore the difference in atomic sizes between elements decreases dramatically with pressure. Based on the predictions of ab initio calculations, we demonstrate in a series of experiments in a multianvil apparatus and in electrically and laser-heated diamond anvil cells that high pressure promotes solubility of magnesium in iron. At the megabar pressure range, more than 10 at. % of Mg can dissolve in Fe and then the alloy can be quenched to ambient conditions. A generality of the concept of high-pressure alloying between immiscible elements is demonstrated by its application to two other Fe group elements, Co and Ni.
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  • Zarechnaya, E Yu, et al. (författare)
  • Superhard Semiconducting Optically Transparent High Pressure Phase of Boron
  • 2009
  • Ingår i: PHYSICAL REVIEW LETTERS. - 0031-9007. ; 102:18, s. 185501-
  • Tidskriftsartikel (refereegranskat)abstract
    • An orthorhombic (space group Pnnm) boron phase was synthesized at pressures above 9 GPa and high temperature, and it was demonstrated to be stable at least up to 30 GPa. The structure, determined by single-crystal x-ray diffraction, consists of B-12 icosahedra and B-2 dumbbells. The charge density distribution obtained from experimental data and ab initio calculations suggests covalent chemical bonding in this phase. Strong covalent interatomic interactions explain the low compressibility value (bulk modulus is K-300=227 GPa) and high hardness of high-pressure boron (Vickers hardness H-V=58 GPa), after diamond the second hardest elemental material.
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  • Gambardella, P., et al. (författare)
  • Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface
  • 2009
  • Ingår i: Nature Materials. - 1476-4660 .- 1476-1122. ; 8:3, s. 189-193
  • Tidskriftsartikel (refereegranskat)abstract
    • Magnetic atoms at surfaces may provide the ultimate paradigm of a solid-state magnetic memory exhibiting either classical , or quantum , behaviour. Individual atoms, however, are difficult to arrange in regular patterns1,2,3,4, . Moreover, their magnetic properties are dominated by interaction with the substrate, which, as in the case of Kondo systems, often leads to a decrease or quench of their local magnetic moment , . Here we show that the supramolecular assembly of Fe and 1,4-benzenedicarboxylic acid molecules on a Cu surface results in ordered arrays of high-spin mononuclear Fe centres on a 1.5 nm square grid. Lateral coordination with the molecular ligands yields unsaturated yet stable coordination bonds, which allow for the chemical modification of the electronic and magnetic properties of the Fe atoms independently from the substrate. The easy magnetization direction of the Fe centres can be switched by oxygen adsorption, thus opening a way to control the magnetic anisotropy in supramolecular layers akin to that employed in metallic thin films , , , .
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  • Resultat 1-10 av 11

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