Fe K-edge X-ray absorption spectroscopy study of Pb(Fe2/3W 1/3)O3-PbTiO3 multiferroic ceramics
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Data
2013-03-21
Autores
Mesquita, A. [UNESP]
Fraygola, B. M.
Mastelaro, V. R.
Eiras, J. A.
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Resumo
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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Palavras-chave
Average structure, Extended X-ray absorption fine structures, Multiferroic ceramics, Rhombohedral symmetry, Short range orders, Structural information, X-ray absorption near-edge structure, X-Ray and neutron diffraction, Absorption spectra, Extended X ray absorption fine structure spectroscopy, Neutron diffraction, X ray absorption near edge structure spectroscopy, X ray absorption spectroscopy, X ray diffraction, Lead
Como citar
Journal of Applied Physics, v. 113, n. 11, 2013.