Charge disproportionation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>probed by diffraction and spectroscopic expe

Blasco, Javier; Aznar, Bartolomé; Garcı́a, J.; Subı́as, G.; Herrero‐Martín, Javier; Stankiewicz, Jolanta

doi:10.1103/physrevb.77.054107

Cited by 88 publications

(64 citation statements)

References 35 publications

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“…These results are in nice agreement with other structural studies of related perovskites in which similar structural transitions with doping level were observed (Blasco et al, 2008;Dann et al, 1994;Tai et al, 1995). …”

Section: Structural Studysupporting

confidence: 82%

Synthetic Methods for Perovskite Materials; Structure and Morphology

Ecija¹,

Vidal²,

Larrañaga³

et al. 2012

Advances in Crystallization Processes

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Section: Structural Studysupporting

confidence: 82%

Synthetic Methods for Perovskite Materials; Structure and Morphology

Ecija¹,

Vidal²,

Larrañaga³

et al. 2012

Advances in Crystallization Processes

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“…Care has to be taken to determine which type of Fe center is present in the analyzed sample. Following the EPR and Raman results, we can assume that the only defect centers present in the anodic region of the single crystal are 6- 28 Assuming a linear relation of the Fe-O distance to concentration, the Fe 3+ concentration in the anodic part can be estimated to be approximately 10%. Integrating the EPR signals, we can further estimate the ratio (cathode to anode) of Fe 3+ to be about 7 (AE1), which puts the concentration of the cubic Fe 3+ -O 6 -center at roughly 70% (AE10%) in the cathodic region.…”

Section: Discussionmentioning

confidence: 99%

Spectroscopic study of the electric field induced valence change of Fe-defect centers in SrTiO3

Lenser

Kalinko

Kuzmin

et al. 2011

Phys. Chem. Chem. Phys.

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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 À V Ö complexes. Through this combinatorial approach, novel structural information on Fe À 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 1Àx Fe x O 3 is briefly discussed.

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“…This is to be compared to the energy shift of 1.26 eV between Fe 3+ and Fe 4+ [27]. Assuming a linear relationship between energy shift of the K absorption edge and local charge, we determined that the amount of charge segregation is 0.6e.…”

mentioning

confidence: 99%

Resonant x-ray scattering in 3d-transition-metal oxides: Anisotropy and charge orderings

Subı́as

Garcı́a

Blasco

et al. 2009

J. Phys.: Conf. Ser.

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The structural, magnetic and electronic properties of transition metal oxides reflect in atomic charge, spin and orbital degrees of freedom. Resonant x-ray scattering (RXS) allows us to perform an accurate investigation of all these electronic degrees. RXS combines high-Q resolution x-ray diffraction with the properties of the resonance providing information similar to that obtained by atomic spectroscopy (element selectivity and a large enhancement of scattering amplitude for this particular element and sensitivity to the symmetry of the electronic levels through the multipole electric transitions). Since electronic states are coupled to the local symmetry, RXS reveals the occurrence of symmetry breaking effects such as lattice distortions, onset of electronic orbital ordering or ordering of electronic charge distributions. We shall discuss the strength of RXS at the K absorption edge of 3d transition-metal oxides by describing various applications in the observation of local anisotropy and charge disproportionation. Examples of these resonant effects are (I) charge ordering transitions in manganites, Fe 3 O 4 and ferrites and (II) forbidden reflections and anisotropy in Mn 3+ perovskites, spinel ferrites and cobalt oxides. In all the studied cases, the electronic (charge and/or anisotropy) orderings are determined by the structural distortions.

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Charge disproportionation inLa1−xSrxFeO3probed by diffraction and spectroscopic expe

Cited by 88 publications

References 35 publications

Synthetic Methods for Perovskite Materials; Structure and Morphology

Synthetic Methods for Perovskite Materials; Structure and Morphology

Spectroscopic study of the electric field induced valence change of Fe-defect centers in SrTiO3

Resonant x-ray scattering in 3d-transition-metal oxides: Anisotropy and charge orderings

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