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

Research output: Contribution to journalArticle

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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
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number10
DOIs
Publication statusPublished - Sep 2004
Externally publishedYes

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Photoelectron spectroscopy
x ray absorption
x ray spectroscopy
Cations
Positive ions
fine structure
photoelectron spectroscopy
disorders
cations
X rays
cleaning
charging
communication
anions
Surface cleaning
oxygen
Vacancies
Anions
ions
Negative ions

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 10, 09.2004.

Research output: Contribution to journalArticle

Nachimuthu, P, Thevuthasan, S, Engelhard, MH, Weber, WJ, Shuh, DK, Hamdan, NM, Mun, BS, Adams, EM, McCready, DE, Shutthanandan, V, Lindle, DW, Balakrishnan, G, Paul, DM, Gullikson, EM, Perera, RCC, Lian, J, Wang, LM & Ewing, RC 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, vol. 70, no. 10. https://doi.org/10.1103/PhysRevB.70.100101
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. / Probing cation antisite disorder in Gd2Ti2O 7 pyrochlore by site-specific near-edge x-ray-absorption fine structure and x-ray photoelectron spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2004 ; Vol. 70, No. 10.
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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.",
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