In:
Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 07, No. 17 ( 1993-07-20), p. 1133-1140
Kurzfassung:
X-ray absorption near edge spectra (XANES) have been measured on the Bi M 5 edge of the semiconducting perovskite-type solid solution Ba 1+x Bi 1−x O 3−δ (−0.43 ≤ x ≤ 0.43) and of superconducting Ba 0.6 K 0.4 BiO 2.93 . The results are interpreted on the basis of the mean Bi valence as determined by iodometric analyses. The near edge spectra and the pre-edge features of the semiconducting samples show distinct differences ascribable to separate Bi(III) and Bi(V) oxidation states, in agreement with the structural results, and their relative intensities directly reflect the Bi(V) content. The spectrum of superconducting Ba 0.6 K 0.4 BiO 2.93 is comparable to the spectra of the semiconducting compounds with a similar Bi oxidation state, with an additional absorption about 20 eV beyond the absorption edge, however. Structural data are also presented.
Materialart:
Online-Ressource
ISSN:
0217-9849
,
1793-6640
DOI:
10.1142/S0217984993001132
Sprache:
Englisch
Verlag:
World Scientific Pub Co Pte Ltd
Publikationsdatum:
1993
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