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Intercalation of ammonia into K3C60 yields (NH3)K3C60 with an orthorhombic distortion of the face-centered cubic (f.c.c.) structure. The f.c.c. has one K and one NH3 per octahedral site. Ammonia intercalation does not appear to change the extent of the charge transfer from K to C60, but the compound is not superconducting. This could be a result of electron localization resulting from structural distortion, leading to the conclusion that the creation of C60-based superconductors is dependant on the change in symmetry of the unit cell as well as the cell size. more...

The alkali-metal fulleride Na2CsC60 is a f.c.c. superconductor with and a value of 14.132 angstroms and a transition temperature (Tc) of 10.5 K. Since cations can occupy the octahedral site of the fulleride, attempts were made to introduce molecular ammonia (NH3) to Na2CsC60. Ammonia was introduced by exposing the sample to 380 torr of NH3 gas distilled from a sodium/liquid-ammonia solution through a vacuum manifold. Introduction of the ion resulted in an increase in a to 14.473 angstroms and an increase in Tc to 29.6K. more...

Processing Techniques for the 93 K Superconductor Ba.sub.2.YCu.sub.3.O.sub.7 THE DISCOVERY OF SUPERCONDUCTIVITY IN COPPER OXide-based ternary and quaternary systems by J. G. Bednorz and K. A. Muller has led to [...] more...