0000000000625954

AUTHOR

Gerardo F. Goya

showing 2 related works from this author

Magnetic ordering in Fe-doped Gd2 BaCuO5

1994

The structural and magnetic properties of iron-doped Gd2BaCuO5 have been studied by X-ray diffractometry, Mossbauer spectroscopy and susceptibility measurements. Mossbauer data on Gd2BaCu0.8Fe0.2O5 show that at room temperature Fe is not magnetically ordered, displaying hyperfine parameters similar to those generally assigned to Fe at Cu(2) sites in the GdBa2(Cu1−x; Fe; x; )3O7 superconductor. Susceptibility measurements demonstrate that Gd2BaCu1−x; Fe; x; O5 behaves like a three-dimensional antiferromagnet withT; N=11.9±0.1 K, independent ofx. The effective magnetic moment calculated within a mean field approximation is consistent with an ordering of the Gd sublattice.

SuperconductivityNuclear and High Energy PhysicsMaterials scienceMagnetic momentCondensed matter physicsFísicaCondensed Matter PhysicsAtomic and Molecular Physics and OpticsMean field theoryFe dopedMössbauer spectroscopyAntiferromagnetismPhysical and Theoretical ChemistryHyperfine structure
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Heat-induced charge transfer in cobalt iron cyanide

2006

The heating of Co(2+) ferricyanide above 801C induces an inner charge transfer from Co(2+) towards Fe(III) to form the mixed valence system Co(2+)Co(III) ferri- ferro-cyanide. This charge transfer takes place preserving the material framework and forming a solid solution of the initial and final species. The cell edge of the cubic cell (Fm-3m) of this solid solution follows a regular variation with

Valence (chemistry)Mössbauer effectInorganic chemistrychemistry.chemical_elementInfrared spectroscopyGeneral ChemistryCondensed Matter Physicschemistry.chemical_compoundNuclear magnetic resonancechemistryMolecular vibrationHeat transferGeneral Materials ScienceFerricyanideCobaltSolid solutionJournal of Physics and Chemistry of Solids
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