Abstract
In this work the magnetic and structural properties are investigated by Mossbauer spectrometry, Vibrating Sample Magnetometry and X-ray diffraction of Nd2(Fe100−x Nb x )14B powdered alloys with x=0, 2 and 4 prepared by arc melting. The Mossbauer spectra of the samples were fitted with several contributions from: Nd2Fe14B, α-Fe and a paramagnetic phase associated with Nd1.1Fe4B4 for x=O and additionally from NbFeB and Nd2Fe17 for x=2 and x=4. The relative fractions of α-Fe and Nd2Fe14B are smaller for x=4 than for x=0, indicating that the amount of these two phases is reduced with increasing Nb content, while the relative fraction of Nd2Fe17 increases. The α-Fe grain size slightly decreases while that ofthe Nd2Fel4B phase is increasing, when the Nb content increases. The hysteresis loops indicate that these samples behave as hard ferromagnets, with a coercive field which decreases when the Nb content increases, but with rather low remanent magnetization.
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