Hyperfine interaction and some thermomagnetic properties of amorphous and partially crystallized Fe70−xMxMo5Cr4Nb6B15 (M = Co or Ni, x = 0 or 10) alloys

As revealed by Mössbauer spectroscopy, replacement of 10 at.% of iron in the amorphous Fe₇₀Mo₅Cr₄Nb₆B₁₅ alloy by cobalt or nickel has no effect on the magnetic structure in the vicinity of room temperature, although the Curie point moves from 190 K towards ambient one. In the early stages of crystallization, the paramagnetic crystalline Cr₁₂Fe₃₆Mo₁₀ phase appears before α-Fe or α-FeCo are formed, as is confirmed by X-ray diffractometry and transmission electron microscopy. Creation of the crystalline Cr₁₂Fe₃₆Mo₁₀ phase is accompanied by the amorphous ferromagnetic phase formation at the expense of amorphous paramagnetic one.