Magnetic properties and synthesis conditions of Nd2Fe23B3 melt-spun alloy

The formation of amorphous and crystalline state of the Nd2Fe23B3 alloy from melt-spun ribbon is presented. The synthesis conditions are investigated combining DSC, X-ray diffraction and thermomagnetic analysis. The thermomagnetic analysis is found to be very useful to optimize the synthesis process. Comparison of these results enables to discuss the thermal stability of both the amorphous and crystalline phases. It is found that the onset temperature of the α-iron formation is significantly smaller than the Nd2Fe23B3 crystallization temperature. Magnetization measurements have also been carried out on the as spun ribbon and the crystalline Nd2Fe23B3 sample. The crystalline phase is found to exhibit a much larger Curie temperature than the amorphous one as well as a larger saturation magnetization. PACS: 75.30.-m; 75.50.Kj; 75.50.Ww; 75.20.En