Influence of Nb on the first stage of crystallization in Fe86−xNbxB14 amorphous alloys

Ultra-high coercivity of (Fe 86− x Nb x B 14 ) 0.88 Tb 0.12 bulk nanocrystalline magnets

“…Our previous studies [17], related to Fe 86Àx Nb x B 14 amorphous melt spun ribbons, show a strong dependence of the activation enthalpy of iron crystallization on Nb content (with a maximum at 6 at.%), see Fig. 7.…”

“…7. Based on the data from [17], the activation enthalpy of iron crystallization for Fe 86Àx Nb x B 14 amorphous alloys is also plotted. As shown, maxima of the quantities presented in Fig.…”

“…The niobium variation was chosen considering the fact that in amorphous alloys, an Nb addition slows down diffusion of iron [17], which, in a combination with a specific cooling rate during the casting procedure, may affect contents of different phases, microstructure and consequently magnetic properties of the examined alloys.…”

Structure studies of Fe81Nb5B14 annealed alloys by Rietveld refinement

“…Density, ρ × 10 3 (kg/dm 3 Both, the amorphous and the nanocrystalline alloys were analysed by the Rietveld refinement [9]. First of all, in case of During the refinement the significant line broadening leads to the deformation of the whole X-ray diffraction pattern and creation the typical for amorphous materials X-ray diffusion pattern [10,11].…”

“…These alloys are usually used as precursors of nanocrystalline materials for which magnetic anisotropy is drastically reduced by random distribution of nanograins [1,2]. The material properties closely depend on the structure, crystallite size, lattice parameters and the crystallisation temperature [3,4]. In this paper the results of structure studies of the annealed amorphous Fe 81 Nb 5 B 14 alloys obtained by the RDF and Rietveld refinement are presented.…”