Superconducting MoNsub(x) prepared by isostatic direct nitriding at high pressure and high temperature

Isostatic direct nitriding at high pressure and high temperature was used to obtain superconducting MoNsub(x) samples with high superconducting critical temperatures. The MoNsub(x) samples of the hexagonal and the cubic structure were prepared at pressures up to 7 GPa and at temperatures up to 2300 K. The highest critical temperature of 15.9 K was found for the hexagonal MoN sample produced at 1.6 GPa and 1720 K. This is the highest critical temperature reported for any superconducting Mo-N sample up to now. (author)