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Mössbauer study of treated Nd2Fe14B

100%

Budzyński M., Constantin V. C., Popescu A.-M. J., Surowiec Z., Tkachenka T. M., Yanushkevich K. I.

issue 1

7-10

The Nd2Fe14B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Mössbauer spectroscopy was applied to study the composition and properties of the surface material of the treated magnets. It is shown that the main phase of the permanent Nd2Fe14B magnet partly decomposes. The released α-Nd at the grain boundaries interacts with water and forms neodymium hydroxide matrix, and the released Fe diffuses into it. The presence of Fe-Nd(OH)3 is reflected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.

The study of crystal and magnetic properties of MnNi0.85Fe0.15Ge

100%

Budzyński M., Valkov V. I., Golovchan A. V., Mitsiuk V. I., Sivachenko A. P., Surowiec Z., Tkachenka T. M.

issue 1

11-14

Magnetic and Mössbauer measurements were performed for MnNi0.85Fe0.15Ge. The Mössbauer data indicate that Fe atoms in MnNi0.85Fe0.15Ge are randomly distributed over two types of metal sites in hexagonal structure. At 77 K, the hyperfine magnetic fields at Fe located in different crystal sites have similar values of about 12.7 and 12.3 T. The random site distribution of the iron atoms in the non-magnetic hexagonal phase at high temperatures is confirmed by the theoretical calculations in fully relativistic Korringa –Kohn –Rostoker (KKR) method.

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2 Nukleonika

2 2015

2 Budzyński M.

2 Surowiec Z.

2 Tkachenka T. M.

1 Constantin V. C.

1 Golovchan A. V.

1 Mitsiuk V. I.

1 Popescu A.-M. J.

1 Sivachenko A. P.

1 Valkov V. I.

1 Yanushkevich K. I.

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Mössbauer study of treated Nd2Fe14B

The study of crystal and magnetic properties of MnNi0.85Fe0.15Ge