Superconducting alloys of interstitial compounds

The preparation and evaluation of some interstitial compounds is described and their potential as high transition temperature superconductors discussed. An evaluation of transition temperature measurements of pseudo-binary and ternary interstitial alloys shows that no simple direct relationship exists between transition temperature and such quantities as valence electron-atom ratio, mass and lattice volume. However, the experimental data have been successfully systematized in terms of a general empirical model which appears capable of predicting the most promising materials for attaining high transition temperatures. Preliminary data demonstrate that a large number of alloyed interstitial compounds exhibit transition temperatures in the vicinity of 18^∘K.