610305.fig.0013
Figure 13: Mössbauer spectra for FeNi massive alloy (foil) and nanoparticles. (a) FeNi (30.3%) foil; (b) FeNi (30.3%) particles with a size of 𝐷 = 1 5  nm; singlet, 𝑆 = 0 . 5 7 ; sextet, 𝑆 = 0 . 4 3 , 𝐻 𝑖 = 3 3 . 0  T; (c) FeNi (35%) particles with a size of 𝐷 = 8  nm; two oxide doublets, 𝑆 Σ = 0 . 1 2 ; two sextets: (I) 𝑆 1 = 0 . 4 4 , 𝐻 𝑖 1 = 3 4 . 5  T; (II) 𝑆 2 = 0 . 4 4 , 𝐻 𝑖 2 = 3 1 . 8  T; (d) FeNi (35%) particles with a size of 𝐷 = 8  nm heated at 900°C for 30 min followed by quenching to room temperature; singlet, S = 0.42; two oxide doublets, 𝑆 Σ = 0 . 1 8 ; sextet, S = 0.43, 𝐻 𝑖 = 3 1 . 8  T.