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Mössbauer study of treated Nd2Fe14B

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

Nukleonika

2015

Vol. 60, No. 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 refl ected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.