Structure and Magnetic Properties of Aerosol Nanoparticles of Fe and Its Alloys

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=15 nm; singlet, 𝑆=0.57; sextet, 𝑆=0.43, 𝐻_𝑖=33.0 T; (c) FeNi (35%) particles with a size of 𝐷=8 nm; two oxide doublets, 𝑆_Σ=0.12; two sextets: (I) 𝑆₁=0.44, 𝐻_𝑖1=34.5 T; (II) 𝑆₂=0.44, 𝐻_𝑖2=31.8 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=0.18; sextet, S = 0.43, 𝐻_𝑖=31.8 T.