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Effect of relaxation on the oxygen K-edge electron energy-loss near-edge structure in yttria-stabilized zirconia

Ostanin, S., Craven, A.J., McComb, D.W., Vlachos, D., Alavi, A., Finnis, M.W., and Paxton, A.T. (2000) Effect of relaxation on the oxygen K-edge electron energy-loss near-edge structure in yttria-stabilized zirconia. Physical Review B, 62 (22). 14728 -14735. ISSN 1098-0121 (doi:10.1103/PhysRevB.62.14728)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevB.62.14728

Abstract

The electron energy-loss near-edge structure (ELNES) at the oxygen K-edge has been investigated in a range of yttria-stabilized zirconia (YSZ) materials. The electronic structure of the three polymorphs of pure ZrO/sub 2/ and of the doped YSZ structure close to the 33 mol%Y/sub 2/O/sub 3/ composition have been calculated using a full-potential linear muffin-tin orbital method (NFP-LMTO) as well as a pseudopotential based technique. Calculations of the ELNES dipole transition matrix elements in the framework of the NFP-LMTO scheme and inclusion of core hole screening within Slater's transition state theory enable the ELNES to be computed. Good agreement between the experimental and calculated ELNES is obtained for pure monoclinic ZrO/sub 2/. The agreement is less good with the ideal tetragonal and cubic structures. This is because the inclusion of defects is essential in the calculation of the YSZ ELNES. If the model used contains ordered defects such as vacancies and metal Y planes, agreement between the calculated and experimental O K-edges is significantly improved. The calculations show how the five different O environments of Zr/sub 2/Y/sub 2/O/sub 7/ are connected with the features observed in the experimental spectra and demonstrate clearly the power of using ELNES to probe the stabilization mechanism in doped metal oxides.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Craven, Prof Alan
Authors: Ostanin, S., Craven, A.J., McComb, D.W., Vlachos, D., Alavi, A., Finnis, M.W., and Paxton, A.T.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X

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