Fe K-edge X-ray absorption spectroscopy study of Pb(Fe2/3W1/3)O-3-PbTiO3 multiferroic ceramics

Journal of Applied Physics Volume: 113 Issue: 11 Published: 2013

Modulus of Fourier transform of k3 v(k) EXAFS spectra for PFW-PT samples as a function of PbTiO3 content at 130 K.

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Writers: A. Mesquita, B. M. Fraygola, V. R. Mastelaro, J. A. Eiras

Keywords: X-ray; spectroscopy; multiferroic ceramics

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)O3–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(Fe2/3W1/3)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.

Rose Portasio
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