AVS 46th International Symposium
    Applied Surface Science Division Wednesday Sessions
       Session AS-WeA

Paper AS-WeA5
Compositional Heterogeneity in Cerium-Based Mixed Oxides Observed by XPS

Wednesday, October 27, 1999, 3:20 pm, Room 6A

Session: Oxides and Insulators
Presenter: G.W. Graham, Ford Motor Company
Authors: G.W. Graham, Ford Motor Company
C.L. Roe, GE Lighting Division
L.P. Haack, Ford Motor Company
A.M. Straccia, Ford Motor Company
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It is argued that compositional heterogeneity in certain reducible mixed oxides, like Ce@sub1-x@Zr@subx@O@sub2@, can be inferred from a variation in the metals ratio, as measured by XPS, between fully oxidized and partially reduced states of the oxide, provided that the characteristic linear dimension of the heterogeneity is at least as large as the typical electron inelastic mean free path. The argument is supported by experimental results from two examples involving mixed phases, one in which the length scale is 100 nm and the other in which the domains are too small for detection by standard x-ray diffraction.