Fe K-edge X-ray absorption spectroscopy study of Pb(Fe2/3W1/3)O3-PbTiO3 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 À x)Pb(Fe 2/3 W 1/3 )O 3 -xPbTiO 3 samples as a function of temperature and PbTiO 3 content. Results obtained by the fits of extended X-ray absorption fine structure consist with rhombohedral symmetry for Pb(Fe 2/3 W 1/3 )O 3 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 PbTiO 3 content increases, a disorder has been detected at local structure of the FeO 6 octahedron. Analysis of X-ray absorption near edge structure spectra did not show modifications in intensity nor energy of transitions. V C 2013 American Institute of Physics.