Artículos de revistas
Fe K-edge X-ray absorption spectroscopy study of Pb(Fe2/3W 1/3)O3-PbTiO3 multiferroic ceramics
Journal of Applied Physics, v. 113, n. 11, 2013.
Universidade Estadual Paulista (UNESP)
Universidade Federal de São Carlos (UFSCar)
Universidade de São Paulo (USP)
The present paper is a comprehensive study concerning Fe K-edge X-ray absorption spectroscopy (XAS) measurements, which were performed to characterize the local structure of (1 - x)Pb(Fe2/3W1/3)O 3-xPbTiO3 samples as a function of temperature and PbTiO3 content. Results obtained by the fits of extended X-ray absorption fine structure consist with rhombohedral symmetry for Pb(Fe 2/3W1/3)O3 composition at temperatures lower than room temperature. This result is in apparent disagreement with X-ray and neutron diffraction characterization which have been reported. This apparent disagreement is related to the fact that XAS probes the short-range order, whereas X-ray diffraction provides structural information about the average structure. Moreover, as the PbTiO3 content increases, a disorder has been detected at local structure of the FeO6 octahedron. Analysis of X-ray absorption near edge structure spectra did not show modifications in intensity nor energy of transitions. © 2013 American Institute of Physics.
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Local electronic structure, optical bandgap and photoluminescence (PL) properties of Ba(Zr0.75Ti0.25)O3 powders Cavalcante, L. S.; Batista, N. C.; Badapanda, T.; Costa, M. G S; Li, M. S.; Avansi, W.; Mastelaro, V. R.; Longo, Elson; Espinosa, J. W M; Gurgel, M. F C
Local electronic structure, optical bandgap and photoluminescence (PL) properties of Ba(Zr0.75Ti0.25)O3 powders Universidade Estadual do Piauí (UESPI); Universidade Estadual Paulista (UNESP); National Institute of Technology; Química; Universidade de São Paulo (USP); Universidade Federal de Goiás (UFG) (2013-06-01)Ba(Zr0.75Ti0.25)O3 (BZT-75/25) powders were synthesized by the polymeric precursor method. Samples were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, X-ray absorption near-edge structure (XANES) ...
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