Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.340, 683-688, 2000
High pressure synthesis of alkali metal intercalated C-60 polymers
Potassium and Rubidium doped A(x)C(60) (A = K, Rb; x = 1, 2, 3) were treated under a pressure of 5 GPa at 573 K. After the treatment, the AC(60) samples (x = I) were transformed into orthorhombic 1D-polymers. The A(2)C(60) samples were transformed into a mixture of fee monomer phase and orthorhombic 1D-polymer. The fee A(3)C(60) Samples were unchanged even after the treatment. These changes are very different from those found in the high-pressure treatments of Li and Na doped C-60 fullerides, which transformed into the rhombohedral LiC60 and NaC60 2D-polymers, tetragonal LixC60 2D-polymer (x greater than or equal to 2), and Na,C60 monomer phase (x greater than or equal to 2). All of the polymers A(x)C(60) (X = 1; A = Li, Na, K, Rb) obtained by the high pressure treatment were semiconductors with the conductivities increasing in the order of Li