Mössbauer study of treated Nd₂Fe₁₄B

Abstract

Abstract. The Nd 2 Fe 14 B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Möss-bauer 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 Nd 2 Fe 14 B magnet partly decomposes. The released -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.

Production and Characterization of Nanostructured Powders of Nd2Fe14B and Fe90Al10 by Mechanical Alloying

“…The Mössbauer parameters of the sample are presented in Table 5 . The sample was fitted with six magnetic sites (sextets) associated with six non-equivalent crystallographic iron sites corresponding to the hard magnetic phase Nd 2 Fe 14 B (16K 1 , 16K 2 , 8j 1 , 8j 2 , 4c, and 4e); which indicates that the sample presents a ferromagnetic behavior [ 16 , 17 ].…”

Influence of W Addition on Phase Constitution, Microstructure and Magnetic Properties of the Nanocrystalline Pr9Fe65WxB26-x (Where: x = 2, 4, 6, 8) Alloy Ribbons

“…Particularly, the doublet line corresponding to the paramagnetic Pr 1+x Fe 4 B 4 crystalline phase was appended to the fitting model [48]. In the case of the Pr 9 Fe 65 W 2 B 24 alloy (Figure 7a), the presence of the soft magnetic Fe 2 B phase was also considered [49]. The Fe 2 B phase was represented by a single sextet.…”