Why Tc of MgB2 is the highest in a number of diborides?
arXiv:cond-mat/0310511
Abstract
It 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)