NEW PREPARATION OF SUPERCONDUCTING ALKALI-METAL FULLERIDES UTILIZING MONOMETHYLAMINE AS SOLVENT

Monomethylamine is employed as a solvent for the preparation of alkali -metal (K, Rb, Cs and mixtures) doped [60]fullerene (C-60). Not only i s the initial solution homogeneous, but also the extended temperature range of this solvent, as compared to ammonia, provides favourable con ditions for the preparation of single phase, well defined materials wi th high superconducting volume fractions. The materials were character ized by de magnetization and X-ray diffraction measurements.