Probing Cation Antisite Disorder in Gd{sub 2}Ti{sub 2}O{sub 7} Pyrochlore by Site-Specific Near-Edge X-ray-Absorption Fine Structure and X-ray Photoelectron Spectroscopy
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
OSTI ID:15009903
Disorder in Gd{sub 2}Ti{sub 2}O{sub 7} is investigated by near-edge x-ray absorption fine structure (NEXAFS) and x-ray photoelectron spectroscopy (XPS). NEXAFS shows Ti{sup 4+} ions occupy octahedral sites with a tetragonal distortion induced by vacant oxygen sites. O 1s XPS spectra obtained with a charge neutralization system from Gd{sub 2}Ti{sub 2}O{sub 7} (100) and the Gd{sub 2}Ti{sub 2}O{sub 7} pyrochlore used in 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.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15009903
- Report Number(s):
- PNNL-SA-38170; 3448; 6295; KC0201020; KP1301020
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 70
- Country of Publication:
- United States
- Language:
- English
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