X-ray photoelectron spectra and atom valency distribution in oxide BaPb1−xBixO3 superconductor

• Published in: Physica. C, Superconductivity Vol. 383; no. 1-2; pp. 117 - 121
• Main Authors: Korolkov, Dimitry V, Kostikova, Galina P, Kostikov, Yuri P
• Format: Journal Article
• Language: English
• Published: 01.12.2002
• ISSN: 0921-4534
• DOI: 10.1016/S0921-4534(02)01313-8

X-ray photoelectron spectra of valent regions and inner atomic levels for BaPb0.8Bi0.2O3, PbO, PbO2, BaPbO3, BaBiO3, NaBiO3, Bi2O3 have been measured. On the basis of the comparison of bond energy values 4f7/2 Pb for PbO (137.9 eV), PbO2 (136.9 eV), BaPbO3 (137.8 and 136.6 eV) and bond energy values 4f7/2 Bi for BaBiO3 (158.4 and 157.5 eV), NaBiO3 (157.6 eV), Bi2O3 (158.2 eV) with analogous values 4f7/2 Pb (137.7 and 136.9 eV) and 4f7/2 Bi (158.2 and 157.4 eV) for studied BaPb0.8Bi0.2O3 it is shown that two valent forms of Pb atoms PbIV, PbII and two valent forms of Bi atoms BiV, BiIII are simultaneously present in the structure of the high temperature oxide superconductor BaPb0.8Bi0.2O3. The parameters of X-ray photoelectron spectra of valent regions of all studied compounds do not contradict this conclusion about the valent states of lead and Bi atoms in the BaPb0.8Bi0.2O3 structure. 9 refs.