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Occupancy of 4d-states in T (T: Mo, Nb) from NEXAFS L 3,2 Spectra of Nd-Fe-B-T Alloys

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Samples of NdyFe(86–y–x)B14Tx (T: Mo, Nb; x = 2, 4; y = 7, 8) alloys were studied by X-ray absorption spectroscopy. The NEXAFS spectra of NdFeB ribbons produced by the melt spinning technique (as quenched, AQ) and subsequently annealed (TT) were taken at Mo and Nb L3,2-edge. We calculated the variations in occupancy of the 4d-states (in both additives), finding an opposite trend in their filling. The most significant changes were observed in the T2Nd7 system, for which the electron occupancy in the 4d levels was modified to an excess of 1 electron/atom (after thermal treatment). The correlation between these results and magnetic features of the alloys are evidenced.

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Correspondence to V. Bilovol.

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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 81, No. 3, pp. 479–482, May–June, 2014.

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Bilovol, V., Saccone, F.D. Occupancy of 4d-states in T (T: Mo, Nb) from NEXAFS L 3,2 Spectra of Nd-Fe-B-T Alloys. J Appl Spectrosc 81, 499–502 (2014). https://doi.org/10.1007/s10812-014-9961-2

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  • DOI: https://doi.org/10.1007/s10812-014-9961-2

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