Recent suggestions [1] of multiferroic behavior in Pb(Ti,Fe)O$_{3}$ has revived an interest in this text-book ABO$_{3}$ type ferroelectric material. Here, we study the effect of Fe-substitution on the local structural and chemical environment of the parent PbTiO$_{3}$ phase. We have carried out extended x-ray absorption fine structure (EXAFS) measurements at the Fe-K, Ti-K and Pb-LIII edge at the Advanced Photon Source, on a series of single phase samples of PbTi$_{1-x}$Fe$_{x}$O$_{3}$ (0$<$ x $<$ 0.5) synthesized using a sol-gel technique. The near edge fine structure (XANES) reveals that Fe cations are trivalent. A fascinating new result is the observation of charge disproportionation of Pb into Pb2+ and Pb4+, likely a result of charge redistribution arising from Fe3+ substitution. ~Radial distribution function (RDF) study of EXAFS spectra from the Ti-K edge and the Fe-K edge confirms that Fe substitutes Ti up to x=0.5. 1. Palkar et al, Appl. Phys. Lett. 90(2007)172901.
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Authors
Ying Zou
Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
University of Wisconsin-Milwaukee, USA
University of Wisconsin-Milwaukee
Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
University of Wisconsin - Milwaukee, USA
Dept of Physics, University of Wisconsin-Milwaukee, USA
Somaditya Sen
University of Wisconsin-Milwaukee, USA
Shishir Ray
University of Wisconsin-Milwaukee, USA
Mark Williamsen
University of Wisconsin-Milwaukee, USA
Tomohiro Shibata
Illinois Institute of Technology, USA
Soma Chattopadhyay
Illinois Institute of Technology, USA
Mali Balasubramanian
APS-Argonne National Laboratory, USA
Prasenjit Guptasarma
Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
University of Wisconsin-Milwaukee, USA
University of Wisconsin-Milwaukee
Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
University of Wisconsin - Milwaukee, USA
Dept of Physics, University of Wisconsin-Milwaukee, USA
