Probing cation antisite disorder in Gd2Ti2O 7 pyrochlore by site-specific near-edge x-ray-absorption fine structure and x-ray photoelectron spectroscopy

P. Nachimuthu, S. Thevuthasan, M. H. Engelhard, W. J. Weber, D. K. Shuh, N. M. Hamdan, B. S. Mun, E. M. Adams, D. E. McCready, V. Shutthanandan, D. W. Lindle, G. Balakrishnan, D. M. Paul, E. M. Gullikson, R. C.C. Perera, J. Lian, L. M. Wang, R. C. Ewing

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    Abstract

    Disorder in Gd2Ti2O7 is investigated by near-edge x-ray-absorption fine structure (NEXAFS) and x-ray photoelectron spectroscopy (XPS). NEXAFS shows Ti4+ ions occupy octahedral sites with a tetragonal distortion induced by vacant oxygen sites. O 1s XPS spectra obtained with a charge neutralization system from Gd2Ti 2O7(100) and the Gd2Ti2O7 pyrochlore used by Chen et al [Phys. Rev. Lett. 88, 105901 (2002)], both yielded a single peak, unlike the previous result on the latter that found two peaks. The current results give no evidence for an anisotropic distribution of Ti and O. The extra features reported in the aforementioned communication resulted from charging effects and incomplete surface cleaning. Thus, a result confirming the direct observation of simultaneous cation-anion antisite disordering and lending credence to the split vacancy model has been clarified.

    Original languageEnglish
    Pages (from-to)100101-1-100101-4
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume70
    Issue number10
    DOIs
    Publication statusPublished - 1 Sep 2004

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    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Nachimuthu, P., Thevuthasan, S., Engelhard, M. H., Weber, W. J., Shuh, D. K., Hamdan, N. M., Mun, B. S., Adams, E. M., McCready, D. E., Shutthanandan, V., Lindle, D. W., Balakrishnan, G., Paul, D. M., Gullikson, E. M., Perera, R. C. C., Lian, J., Wang, L. M., & Ewing, R. C. (2004). Probing cation antisite disorder in Gd2Ti2O 7 pyrochlore by site-specific near-edge x-ray-absorption fine structure and x-ray photoelectron spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 70(10), 100101-1-100101-4. https://doi.org/10.1103/PhysRevB.70.100101