Abstract
Abstract The changes of local structure for Ga in Nd 13.0 Fe 68.2 Co 10.8 Ga 1.0 Zr 0.1 B 6.9 during hydrogenation, disproportionation, desorption and recombination (HDDR) process are studied by fluorescence XAFS in order to understand the evolution of magnetic anisotropy by HDDR process. Comparing the observed Ga XAFS data with the calculated ones, using ab initio calculation (FEFF), Ga is proved to occupy preferentially an Fe(c) site in the Nd 2 Fe 14 B structure before disproportionation and dissolves in α-Fe after the disproportionation. In the recombined state Ga redistributes into two phases, i.e. Nd 2 Fe 14 B and a Nd-rich phase. The behavior of Ga during the HDDR process differs from Zr which occupies Fe(j 2 ) sites before disproportionation and after the disproportionation.
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