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Superhard superconducting samples with a critical temperature of T C  = 10.5 - 12.6 K were obtained by high-pressure / high-temperature sintering of synthetic diamond powders coated with a niobium film and in 50% - 50% composition with superhard C 60  fullerene. Superhard superconductors with T C  = 9.3 K were obtained when diamond and molybdenum powders were sintered at a pressure of 7.7 GPa and a temperature of 2173 K. Superconducting samples with T C  = 36.1 - 37.5 K have been obtained in the systems diamond-MgB 2  and cubic boron nitride-MgB 2 .

Superhard Superconductor Composites Obtained by Sintering of Diamond, c-BN and C 60 Powders with Superconductors