NEW GRAPHITE-INTERCALATION COMPOUNDS C4KO2 AND C8KO2

New graphite intercalation compounds were obtained by intercalation of potassium superoxide KO2 into graphite in presence of potassium metal . Stage 1 (assigned formula C4KO2, I-c = 8.44 Angstrom) and stage 2 (a ssigned formula C8KO2, I-c = 11.75 Angstrom) compounds were isolated. Quadruple intercalate layer K-O-O-K is supposed. The results of magnet ic susceptibility measurements suggest nonmagnetic states of oxygen sp ecies. Metal-like temperature dependence of c-axis resistivity was obt ained in 1.5-300 K range where the resisitivity values at room tempera ture are 0.07 Omega cm and 0.81 Omega cm for C4KO2 and C8KO2, respecti vely.