Fe K-edge X-ray absorption spectroscopy study of Pb(Fe2/3W 1/3)O3-PbTiO3 multiferroic ceramics
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Undergraduate course
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AIP Publishing
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Abstract
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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Keywords
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
Language
English
Citation
Journal of Applied Physics, v. 113, n. 11, 2013.
