One-step synthesis of nitrogen-rich Mo2C1−xNx solid solution with enhanced superconductivity†
A nitrogen doping strategy is often adopted to improve the superconductivity of Mo2C for raising the Fermi surface, yet it is difficult to prepare Mo2C with high nitrogen content. The highest doping content in the literature is only 1.36%, plus the preparation process is complex. In this work, a series of Mo2C1−xNx solid solutions (x ≤ 0.57) was prepared by simple solid-state reaction. The structure of Mo2C is unchanged after nitrogen doping. The unit cell parameters changed with anisotropy. A change in superconductivity of Mo2C has been observed. Its superconducting critical temperature (Tc) is increased from 5.5 K to 7.9 K.