2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22507It is shown, that the problem rising Tc diborides is a problem of nonstoichiometry in a plane of boron in diborides of heavy metals being compounds of variable composition.8 pages, 2 figures. The paragraph 2.4.2. from the chapter L.M. Volkova, S.A. Polyshchuk, F.E. Herbeck, "Correlation of Tc with Crystal Chemical Parameters in High-Tc Cuprates, Diborides and Borocarbides: Concept of Arrangement and Function of Layered Superconductors" in "Focus on Superconductivity Research" Barry P. Martins., Ed., Nova Science Publisher, Inc. N.Y., 2003, (in print)SuperconductivityMaterials Sciencetext