Spectroscopic study of the electric field induced valence change of Fe-defect centers in SrTiO(3)

Lenser, C.; Dittmann, R.; Kuzmin, A.; Waser, R.; Szot, K.; Kalinko, A.; Purans, J.; Berzins, D.

doi:10.1039/c1cp21973a

Journal Article

Spectroscopic study of the electric field induced valence change of Fe-defect centers in SrTiO(3)

Lenser, C.FZJ* ; Kalinko, A. ; Kuzmin, A.FZJ* ; Berzins, D. ; Purans, J. ; Szot, K.FZJ* ; Waser, R.FZJ* ; Dittmann, R.FZJ*

2011
RSC Publ. Cambridge

Physical Chemistry Chemical Physics 13, 20779 - 20786 (2011) [10.1039/c1cp21973a]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7352 doi:10.1039/C1CP21973A

Abstract: The electrochemical changes induced by an electric field in Fe-doped SrTiO(3) have been investigated by X-ray absorption spectroscopy (XANES and EXAFS), electron paramagnetic resonance (EPR) and Raman spectroscopy. A detailed study of the Fe dopant in the regions around the anode and cathode reveals new insights into the local structure and valence state of Fe in SrTiO(3) single crystals. The ab initio full multiple-scattering XANES calculations give an evidence of the oxygen vacancy presence in the first coordination shell of iron. Differences in the length and disorder of the Fe-O bonds as extracted from EXAFS are correlated to the unequivocal identification of the defect type by complementary spectroscopical techniques to identify the valence state of the Fe-dopant and the presence of the Fe - V(Ö) complexes. Through this combinatorial approach, novel structural information on Fe - V(Ö) complexes is provided by X-ray absorption spectroscopy, and the relation of Fe-O bond length, doping level and oxidation state in SrTi(1-x)Fe(x)O(3) is briefly discussed.

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Note: This work has been performed within the EC FP7 MATERA project "Functional materials for resistive switching memories" (FMRSM). The authors acknowledge financial support by the NRW-EU Ziel 2-Programm. The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 226716 (Project I-20090034 EC). A.K. and J.P. were supported by the ESF and ERAF Projects 2009/0202/1DP/1.1.1.2.0/09/APIA/VIAA/141 and 2010/0272/2DP/2.1.1.1.0/10/APIA/VIAA/088, respectively. The authors would like to thank the European Synchrotron Radiation Facility (ESRF) for the beamtime at BM29 (project number MA-923), as well as the Hamburger Synchrotronstrahlungslabor (HASYLAB) for the beamtime at beamline A1 (project number I-20090034 EC) and the respective beamline personnel for their support, as well as Sebastian Wicklein and Marcin Wojtyniak for assistance during the beamtimes. The authors thank Dr R. Merkle for the possibility to use reference experimental EXAFS data of the powders solid solutions SrFe<INF>0.1</INF>Ti<INF>0.9</INF>O<INF>3-x</INF>, and P. Meuffels and C. Makovicka for providing the LaFeO<INF>3</INF> powder.

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