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M. S. Kaluzshskikh, S. N. Savvin, G. N. Mazo, N. V. Alov
Determination of the
surface composition in perovskite-like cuprates by X-ray photoelectron
spectroscopy
Abstract
Complex cuprates with
anion-deficient perovskite-like (La0.85Sr0.15CuO2.5-d)
and layered K2NiF4-like (La2-xSrxCuO4-d,
x=0.15; 0.6; 1.0) crystal have been prepared by solid-state route. XRD
analysis showed that single-phase samples were obtained. Surface composition of
the samples was determined using XPS. It was found, that both cross-section of
the photoionization and an average length of the photoelectron free path should
be taken into account when calculating surface composition. The surface was
shown to be enriched by Sr, regardless of the bulk composition of the samples.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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