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

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

Nukleonika

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2015

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Vol. 60, No. 1

11--14

EN

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 hyperfi ne magnetic fi elds 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 confi rmed by the theoretical calculations in fully relativistic Korringa−Kohn−Rostoker (KKR) method.

2

Mössbauer study of treated Nd2Fe14B

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

Nukleonika

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2015

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Vol. 60, No. 1

7--10

EN

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 refl ected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.

3

Study of B8 - type solid solutions of Al and Si in manganese antimonide

Budzyński M., Mitsiuk V. I., Ryzhkovskii V. M., Surowiec Z., Tkachenka T. M.

Nukleonika

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2013

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Vol. 58, No. 1

149-152

EN

The Mn1.1Sb1.yAly (0 less-than or equal to y less-than or equal to 0.2) and Mn1.1Sb1-ySiy (0 less-than or equal to y less-than or equal to 0.1) solid solutions with the B8-type of crystal structure were obtained. The magnetic measurement revealed that the partial substitution of Sb atoms by Al or Si practically do not affect the specific magnetization and Curie temperatures. Mossbauer data showed the local redistribution of atoms in solid solutions by comparison with that in the parent Mn1.10Sb.

4

Mössbauer investigations of Mn2-xFexP0.5As0.5

Mitsiuk V. I., Tkachenka T. M., Budzyński M., Surowiec Z., Valkov V. I.

Nukleonika

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2013

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Vol. 58, No. 1

169-172

EN

Magnetic and Mossbauer measurements were performed for Mn2.xFexP0.5As0.5, 0.5 less-than or equal to x less-than or equal to 1.0. It was shown that with decreasing Fe content magnetic interaction significantly weakens. Low temperature magnetic structure could be explained as a superposition of ferromagnetic and antiferromagnetic contributions to the whole magnetic moment of the alloy.