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

Figure 12

Mössbauer spectra for FeMn (32% and 34.65%) nanoparticles. (a) Small FeMn (32%) particles with the core size of D = 3 nm; (b) small FeMn (34.65%) particles with the core size of D = 3 nm; relative areas (S) of spectrum components: singlet, S = 0.06; doublet, S = 0.25; two sextets: (I), S = 0.17, hyperfine field 𝐻_𝑖1=35.0 T; (II), S = 0.17, 𝐻_𝑖2=31.0 T; “sagged” line, S = 0.35; (c) FeMn (34.65%) particles with the core size of D = 7 nm crumbled in an agate mortar; singlet, S = 0.03; sextet S = 0.56, 𝐻_𝑖=35.0 T; “sagged” line, S = 0.35; (d) FeMn (34.65%) particles with the core size of D = 7 nm after heating in vacuum at 500°C for 1 h; singlet, S = 0.30, doublet, S = 0.35; sextet S = 0.35, 𝐻_𝑖=34.0 T; (e) FeMn (34.65%) particles with the core size of D = 15 nm; singlet, S = 0.14; sextet S = 0.86, 𝐻_𝑖=32.9 T.