Short-range order in gallium solid solutions in α-iron

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Abstract

Short-range order in soft magnetic FeGa alloys containing from 3 to 25 at% Ga was studied using nuclear gamma resonance (Mossbauer) spectroscopy. The Mossbauer spectra were analyzed via fitting with subspectra corresponding to different configurations of the neighborhoods of the Fe atoms with Ga in the first and second coordination shells. It has been shown that in samples of alloys containing from 3 to 17 at% gallium, the short-range order is almost independent of the heat treatment conditions (quenching from a paramagnetic state or exposure in a ferromagnetic state) and is characterized by the presence of pairs of Ga atoms in the position of the second neighbors (B2-type clusters). At a Ga content of 17 to 21 at%, the portion of B2 clusters turns out to be significantly higher after quenching than after annealing, which correlates with the observed effect of heat treatment on the magnitude of magnetostriction. As the Ga concentration (21–25 at%) further increases, the observed features in the distribution of Ga atoms indicate the appearance and growth of D03 phase regions.

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N. V. Ershov

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Author for correspondence.
Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

N. M. Kleinerman

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

Yu. N. Gornostyrev

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

V. A. Lukshina

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

D. A. Shishkin

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002

A. V. Timofeeva

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

S. P. Naumov

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

A. E. Svirid

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

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2. Fig. 1. Experimental spectra of Fe−Ga alloy samples (shown as dots) containing 3, 6, 9, 12, 15, 17, 21, and 25 at.% gallium (from top to bottom), quenched in water after holding in the paramagnetic state (left) and slowly cooled after ferromagnetic annealing (right). The solid line enveloping the dot is the result of decomposing the experimental spectrum into subspectra (thin solid lines). The difference spectrum is shown below each spectrum—the difference between the experimental spectrum and the result of its approximation.

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3. Fig. 2. Histograms of the distribution of fractions and isomer shifts (δ) corresponding to the contributions of the main coordinations around iron atoms, such as 8:0, 7:1, 6:2, 5:3 and 4:4 (combined by dashed rectangles), by the value of the STP (H), obtained by approximating the subspectra of the Mössbauer spectra of iron–gallium alloy samples containing 3, 6, 9, 12, 15, 17, 21 and 25 at.% Ga.

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4. Fig. 3. Concentration dependences of the proportions (probabilities) of contributions to the Mössbauer spectra of FeGa alloys of the 8:0, 7:1, 6:2, 5:3 and 4:4 configurations are compared with their average statistical probabilities. The results obtained after quenching from the paramagnetic state and annealing in the ferromagnetic state are presented. Average statistical probabilities (BD — binomial distribution, binomial distribution of atoms over the CS) are shown on the graph by dashed lines.

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