Test of Tc-Predictions Using the Rigid Band Model for Refractory Compounds

摘要: B1-compounds are particularly suitable to test Tc-predictions, as they form continuous solid solutions with intermediate properties reflecting the changing number of valence electrons (VE). Thin films Nb1-xMoxC, Nb1-xMoxC1-yNy and MoCxNy systems were prepared by sputtering. There serious discrepancies between theory experimental results. In particular, predicted minimum at 10.45 VE was not observed. It possible prepare Nb0.3Mo0.7C 9.7 stoichiometrically. Instead expected Tc 17 K only 13 measured. NbCl-yNy, Ti1-xNbxN Ti1-xNbxC1-yNy for around a up 17.3 is observed in agreement theory. However, where theoretically narrow maximum predicted, high values wide range VE.