Table 1 Structural parameters and superconducting transition temperatures (TC) of transition-metal nitrides.

From: Discovery of Superconductivity in Hard Hexagonal ε-NbN

Compounds

hexagonal ε-NbN

δ-NbN

cubic ZrN

β-ZrNCl

Lattice constant (Å)

 a

2.9722

4.4154

4.576

3.606

 c

11.2891

4.4154

4.576

27.67

Bond length (Å)

M-N

2.2219

2.2077

2.2890

2.2127

N-N

2.9728

3.2122

–

–

Bond angle

N-M-N

82.3°

90°

90°

115.9°

 TC(K)

11.6

17.5

10.7

13.0

Ref.

This study

This study

Ref. 40

Ref. 40,41

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