Navegação Ciências Exatas e da Terra por Assunto "Compostos de ferro"
Resultados 1-10 de 10
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Co-cubstitution effects on the Fe valence in the BaFe2As2 superconducting compound : a study of hard x-ray absorption spectroscopy
(2011) [Artigo de periódico]The Fe K x-ray absorption near edge structure of BaFe₂-xCoxAs₂ superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides ... -
Defects and magnetic hyperfine fields in ZrFe/sub 2/ investigated using perturbed-angular-correlation spectroscopy
(1999) [Artigo de periódico]We have measured the temperature dependence of the electric and magnetic hyperfine interactions at 181Ta nuclei substituted into the Zr site in the Laves-phase compound ZrFe2, using the perturbed angular correlation of g ... -
Indirect optical absorption and origin of the emission from β-FeSi2 nanoparticles : bound exciton (0.809 eV) and band to acceptor impurity (0.795 eV) transitions
(2010) [Artigo de periódico]We investigated the optical absorption of the fundamental band edge and the origin of the emission from β-FeSi2 nanoparticles synthesized by ion-beam-induced epitaxial crystallization of Fe+ implanted SiO2 / Si 100 followed ... -
Magnetic behavior of the NixFe1−xNb2O6 quasi-one-dimensional system : isolation of Ising chains by frustration
(2012) [Artigo de periódico]Physical properties of the NixFe1−xNb2O6 compounds are investigated combining x-ray and neutron powder diffraction with magnetic and calorimetry measurements as well as 57Fe Mössbauer spectroscopy. This system is known to ... -
Magnetotransport properties in the magnetic phase of BaFe2−xTxAs2 (T = Co,Ni) : a magnetic excitations approach
(2018) [Artigo de periódico]Because of their complex Fermi surfaces, the identification of the physical phenomena contributing to electronic scattering in the Fe-based superconductors is a difficult task. Here, we report on the electrical resistivity, ... -
Mechanical properties of highly oriented FeSe0.5Te0.5 superconductor
(2012) [Artigo de periódico]We have synthesized highly oriented samples of the superconducting compound FeSe0.5Te0.5 and investigated its mechanical properties. These samples were characterized by scanning electron microscopy (SEM) with energy-dispersive ... -
Phase evolution and magnetic properties of a high-energy ball-milled hematite-alumina system
(2004) [Artigo de periódico] -
Pressure and chemical substitution effects in the local atomic structure of BaFe2As2
(2011) [Artigo de periódico]The effects of K and Co substitutions and quasihydrostatic applied pressure (P < 9 GPa) in the local atomic structure of BaFe2As2, Ba(Fe0.937Co0.063)2As2 and Ba0.85K0.15Fe2As2 superconductors were investigated by extended ... -
Suppression of magnetic ordering in quasi-one-dimensional FexCo1−xNb2O6 compounds
(2011) [Artigo de periódico]We present a systematic investigation of the series of compounds FexCo1−xNb2O6 by means of x-ray and neutron powder diffraction combined with magnetic measurements, carried out in the paramagnetic as well as in the ordered ... -
Tunable asymmetric magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films
(2014) [Artigo de periódico]We investigate the magnetization dynamics through the magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films. We observe that the magnetoimpedance response is dependent on the thickness of the non-magnetic Cu spacer ...
