Table 1.

Refined ⁵⁷Fe‐Mössbauer spectra parameters before annealing and of the major component after annealing.[a]

Sample	δ [mm s−1]	ΔE Q [mm s−1]	ΔE M (T)
57Fe in N2 (0.1 MPa, not annealed)	−0.073±0.005	0.011±0.009	32.645±0.037
57Fe in N2 (11.9 GPa, annealed)	0.305±0.012	0.015±0.019	11.553±0.063
ζ‐57Fe2N in N2 (0.1 MPa, not annealed)	0.441±0.023	–	–
ζ‐57Fe2N in N2 (17.7 GPa, annealed)	0.356±0.002	0.012±0.003	10.814±0.014

[a] δ represents the center shift, ΔE_Q the quadrupole splitting, and ΔE _M the hyperfine field. Spectra were fit using MossA software.32