Mössbauer study of Fe-B alloys containing Nd additives

Influence of Si substitution on phase components and magnetic properties of crystallized Nd4Fe77.5B18.5 alloys

“…It is of interest to note the coercivity decreases rapidly with increasing Si content. The studies on X-ray diffraction [6,14], nuclear magnetic resonance [14,15], M. ossbauer spectra [10,14,15] and magnetic measurements show that in NdFeB alloys with low Nd concentration, Nd atoms enter into bct-Fe 3 B phase leading to an enhancement of magnetocrystalline anisotropy. The higher coercivity originates from the bct-Fe 3 B phase containing Nd.…”

“…This magnet is of commercial interest because the costly magnetic alignment step is not required to obtain maximum performance and the alloys require less of the expensive rare earth element. In previous work [8][9][10][11] we have studied the structure and magnetic properties of NdFeB alloys with low Nd content and the effect of substitution of elements. It is found that as-quenched NdFeB alloys with low Nd concentration are in the amorphous state.…”

Magnetic hardening effect of Fe3B alloy by partial substitution of Fe by Nd

“…3(b)). This implies that an ordered structure is formed in the t-Fe 3 B grains of A1 which is caused by the large Nd atoms preferentially occupying one of the three unequal Fe sites in t-Fe 3 B grain [8,9]. The crystal structure and hyperfine (HF) information of t-Fe 3 B has been listed in Table 1.…”

The development of the phase composition in melt-spun alloys with thermal treatment: a combined NMR and Mössbauer study

“…Since then, many papers have been published concerning investigations of the phase composition of crystallized Nd-Fe-B with a few per cent of Nd by means of x-ray diffraction, spin-echo nuclear § Present address: Max-Planck-Institut für Metallforschung, Institut für Physik, Heisenbergstrasse 1, D-70659 Stuttgart, Germany. magnetic resonance (NMR) and the Mössbauer effect (ME) [5][6][7][8]. The structural information can be obtained either from diffraction or from hyperfine-interaction techniques.…”

“…Thus, a combination of x-ray diffraction, NMR and ME can obtain a more reliable result. In an earlier work, we investigated the effect of heat treatment on the phase composition, magnetic properties and hyperfine fields (HFs) of melt-spun Nd 4 Fe 77.5 B 18.5 alloys [5][6][7][8][9]. However, the effect of heat treatment on the phase compositions of Gd 4 Fe 77.5 B 18.5 alloys is still not known.…”