Abstract
Effect of the oxygen content in ceramic high-temperature superconductors Bi2Sr2CuO6 + δ on their phase composition, crystal structure, and charge state of cations has been studied. As the oxygen content changes, the lattice parameters were shown to exhibit nonmonotonic variation; no changes in the phase composition and charge state of cations take place. According to neutron diffraction data, the overstoichiometric oxygen atoms are introduced only into the BiO1 + δ layers. The nonmonotonic variations observed are explained assuming that, at a certain oxygen content, the hole charge carriers induced by introduced oxygen are localized in the BiO1 + δ layers rather than “flow down” into superconducting CuO2 layers.
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