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

Figure 16

Mössbauer spectra of Fe₃Pt alloy. (a) bcc foil thick 4 μm; two sextets: (I) 𝑆₁=0.75, 𝐻₁=35.3 T; (II) 𝑆₁=0.25, 𝐻₁=32.3 T; (b) bcc particles of 7 nm size; singlet 𝑆₁=0.69; sextet, 𝑆₁=0.31, 𝐻₁=33.3 T; (c) particles of 20 nm size; singlet 𝑆₁=0.02; sextet, 𝑆₂=0.44, 𝐻₁=33.3 T; “sagged” line 𝑆₃=0.54; (d) the same powder after heating at 650°C in vacuum 2.7 × 10⁻² Pa for 2 h; singlet 𝑆₁=0.15; sextet, 𝑆₁=0.85, 𝐻₁=33.7 T.