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Magnetism
Local atomic and magnetic structures of nanocrystalline Fe$_{75}$Cr$_{10}$B$_{15}$ alloy
V. S. Pokatilova,
T. G. Dmitrievaa,
V. V. Pokatilova,
N. B. Dyakonovab a Moscow State Technical University of Radio Engineering, Electronics and Automation, Moscow, 119454, Russia
b I. P. Bardin Central Research Institute of Iron and Steel Industry
Abstract:
The crystal, local atomic and magnetic structures of Fe
$_{75}$Cr
$_{10}$B
$_{15}$ alloys annealed at 440–473
$^\circ$C for 5 min have been studied using X-ray diffraction and
$^{57}$Fe Mössbauer spectroscopy. At the annealing temperature
$T_\alpha$ = 440
$^\circ$C, nanocrystals of the
$\alpha$-Fe phase (
$\sim$1%) precipitate in the amorphous matrix of the alloy. The complete crystallization of the amorphous alloy occurs at
$T_\alpha$ = 473
$^\circ$C with the formation of
$\alpha$-Fe nanocrystals 26
$\pm$ 2 nm in size and nanocrystals of tetragonal boride
$t$-Fe
$_3$B 47
$\pm$ 2 nm in size. It has been found that chromium atoms are located in nanocrystals of the
$\alpha$-Fe and
$y$-Fe
$_3$B types. The distribution functions of hyperfine fields in the nanocrystalline Fe
$_{75}$Cr
$_{10}$B
$_{15}$ alloy reconstructed from the Mössbauer spectra (at
$T_\alpha$ = 473
$^\circ$C) show that there are three allowed states of iron atoms in the
$\alpha$-Fe phase and three equally probable crystallographic nonequivalent states of iron in the
$t$-(Fe,Cr)
$_3$B phase. The chromium concentration
$x$ in the
$\alpha$-Fe(Cr) phase is found to be
$\sim$10 at%. The substitution of chromium atoms for iron atoms in
$t$-Fe
$_3$B substantially decreases local magnetic moments of the iron atoms.
Received: 30.01.2012
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