Hard superconducting nitrides.

  title={Hard superconducting nitrides.},
  author={Xiao-jia Chen and Viktor V Struzhkin and Zhigang Wu and Maddury S. Somayazulu and Jiang Qian and Simon Kung and Axel N\orlund Christensen and Yusheng Zhao and Ronald E. Cohen and Ho-kwang Mao and Russell J. Hemley},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={102 9},
Detailed study of the equation of state, elasticity, and hardness of selected superconducting transition-metal nitrides reveals interesting correlations among their physical properties. Both the bulk modulus and Vickers hardness are found to decrease with increasing zero-pressure volume in NbN, HfN, and ZrN. The computed elastic constants from first principles satisfy c11 > c12 > c44 for NbN, but c11 > c44 > c12 for HfN and ZrN, which are in good agreement with the neutron scattering data. The… CONTINUE READING

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