Abstract
A first-principles plane-wave pseudopotential method based on the density functional theory is used to investigate the structural, elastic and electronic properties of M 4N 5 and M 5N 6 (M = a transition metal (TM) Nb, Ta). C 33 elastic constant for all compounds is found to be much larger than C 11, indicating that a-axis is more compressible than c-axis. Interestingly, we find that C 33 and C 11 are significantly larger than other elastic constants, resulting in a pronounced elastic anisotropy.
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