Structure and magnetic properties of the α-FeB phase obtained by mechanical working

Abstract

The crystal structure and the magnetic properties of the low‐temperature α‐FeB phase obtained by working in a mill are investigated by X‐ray diffraction analysis, Mössbauer study, and magnetic measurements. The crystal structure of α‐FeB is determined as a CrB(Bf) structure type with a = 0.2951 nm, b = 0.7564 nm, and c = 0.2953 nm. Parameters of the hyperfine interactions in α‐FeB are also determined. The Mössbauer data analysis suggests that the observed change of Heff in α‐FeB in comparison with the value for the β‐modification is related with the change of orientation of the magnetic moments of Fe atoms making an angle of ≈40° with respect to the crystallographic b‐axis. It is shown that β‐ and α‐FeB have close values of magnetization and Curie temperature Tc = 580 K.

Pressure-induced phase transitions in AgClO4

“…In fact, in the FeB boride itself, the B33-phase (Cmcm) has been induced at low temperature. 52 The similarities between both structural types are illustrated in Fig. 9.…”

Wet‐Chemical Synthesis of Nanoscale Iron Boride, XAFS Analysis and Crystallisation to α‐FeB

“…Barinov et al [8] published the CrB structure type for a-FeB. Both structures are closely related and characterised by rows of trigonal prisms sharing their rectangular faces, and infinite zigzag chains of boron atoms running through the rectangular faces.…”

Peculiarities of the Transition to an Equilibrium State of Mechanically Alloyed Fe/Amorphous Phase Fe-B/B Nanocomposite with Composition Fe(68)B(32) upon Thermal Treatment

“…The formation of boride Fe 23 B 6 at annealing temperatures of 700-900°C was not also revealed. The formation of boride Fe 23 B 6 in samples subjected to mechanical treatment was observed elsewhere [12,28]. In [28], mechanical grinding was carried out using a vessel and balls made of WC.…”

“…A component with HFMF H = 235 kOe corresponds to this boride in the Mösbauer spectra. Note that, for stable t-Fe 2 B, H = 240 kOe [17,28,34]. No other metastable borides are observed.…”

“…1) becomes a dominant phase. This boride is manifested in Möss-bauer spectra and corresponding P(H) functions as a component with HFMF value H = 235 kOe [28]. This phase was earlier [5] denoted as x-Fe 2 B.…”