Abstract
There are two points of view in the literature on the mechanism of formation of high-temperature superconductors (HTSC - X, where X =Cl, Br, I). One of these supposes that a topotactic redox intercalation reaction proceeds, the other assumes that the isomorphous substitution of oxygen by halogens takes place. It has been shown by tensometric measurements, the anomalous scattering effect, EXAFS, and Mo¨ssbauer spectroscopy that the interaction of halogens with the tetragonal modification of YB a 2Cu 3O 7− x proceeds by intercalation of halogens into the anion vacant position of the Cu(1) layer. The charge transfer from the Cu(2) layers to the halogens results in the formation of electron holes in the Cu O pyramids, which determines HTSC-properties of the intercalate compounds obtained.
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