Abstract
Crystallization behavior and magnetic properties of melt-spun Nd x Fe 82– x B 18 and Nd x Fe 79– x Cr 3B 18 ( x = 3.5–5.5 at%) alloys have been investigated by means of X-ray diffraction, transmission electron microscopy and magnetization measurements. For both the systems, a similar step proceeds until Fe 3B and Nd 2Fe 23B 3 crystallize from the amorphous state. For the Nd 5Fe 77B 18 alloy the metastable compound Nd 2Fe 23B 3 then decomposes along with Fe 3B into Fe and nonmagnetic Nd 1.1Fe 4B 4 without any occurrence of hard-magnetic Nd 2Fe 14B. For the Nd 5Fe 74Cr 3B 18 alloy, the decomposition of Nd 2Fe 23B 3 into Nd 2Fe 14B and Fe 3B occurs, resulting in a nanocomposite structure with a large fraction of Nd 2Fe 14B and a uniform grain size distribution. It is concluded that Cr contributes to increasing coercivity of Fe 3B/Nd 2Fe 14B nanocomposite magnets by inducing the desired scheme of decomposition of the Nd 2Fe 23B 3 compound.
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