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The comparative study of Nd-Fe-B magnetic materials with different Nd content

Talijan N., Cosovic V., Grujic A., Zivkovic D., Zak T.

Archives of Materials Science

2008

Vol. 29, nr 4

184-188

For better understanding of different Nd content effect on the magnetic properties of three types commercial Nd-Fe-B alloys with 10-12 wt% Nd (Nd-low), 21-25 wt% (Nd-stoich.), and 26-29 wt% Nd (Nd-rich) were simultaneously analyzed using X-Ray and 57Fe Mossbauer spectroscopy (MS) analysis. The observation was based on correlation of starting chemical composition with phase composition and magnetic properties in optimized magnetic state.

Thermomagnetic behavior and microstructure of a rapidly quenched Nd14Fe79B7 alloy

Cosovic V., Talijan N., Stajic-Trosic J., Grujic A., Zivkovic D., Zak T.

Archives of Materials Science

2007

Vol. 28, nr 1-4

20-24

Changes in the phase composition and crystallite size, as well as changes in the magnetic behavior of overstoichiometric Nd14Fe79B7 alloy (32 mass% Nd), caused by the thermomagnetic measurements (TM), were observed in regard to the optimal magnetic state of this alloy. In the optimized magnetic state, the hard magnetic phase Nd2Fe14B is identified as the primary phase (up to 95 mass %), with a mean crystallite size about 60 nm, as determined by XRD analysis and Transmission electron microscopy (TEM). The derogation of magnetic properties after TM is due to decreased amount of Nd2Fe14B phase, the formation of Nd2O3 and different Fe(O)B phases, as well as an increase in the mean crystallite size (e.g. Nd2Fe14B . 95 nm).