POLYMORPHOUS CARBON COMPOUND Russian patent published in 1997 - IPC

FIELD: production of superhard materials. SUBSTANCE: high-pressure chamber of the type "Bridgeman anvil" or "toroid" is charged with fullerene $$$, which is then exposed to pressure 5-12 GPa at 200-350 C to yield polymorphous carbon compound with following interplane distances: $$$ 7.76 $$$ 0.10; 6.10 $$$ 0.30; 4.79 $$$ 0.05; 4.58 $$$ 0.05; 4.13 $$$ 0.05; 3.71 $$$ 0.10; 3.24 $$$ 0.10; 2.90 $$$ 0.10; 2.49 $$$ 0.10; 2.20 $$$ 0.10. Produced material leaves scratches on surface of boron nitride and diamond. EFFECT: improved procedure. 2 tbl, 5 dwg