SUPERCONDUCTING MONX 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 MoN//x samples with high superconducting critical temperatures. The MoN//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.