Abstract
1 0B, 11B, 57Fe, and 59Co spin-echo NMR experiments have been performed for naturally abundant and 10B-enriched Nd2Fe14B and Nd2Fe14−xCox B (x≤0.7) at 1.3 and 4.2 K for frequencies from 10 to 300 MHz. The Fe hyperfine field (HF) values in the Nd2Fe14B compound and their assignment to the six iron sites are the following: 302(e) 320(c) 325(k1), 334( j1), 352(k2), and 378( j2) kOe. The substitution of Co for Fe decreases the HF at the Fe nuclei at j2, k2, j1, k1, and c sites while no obvious change in the HF at the e site nor at the B nuclei has been found. The spin-echo amplitude corresponding to the Fe(k2) site line decreases with increasing Co content. A complex 59Co spectrum is found in the frequencies between 150 and 260 MHz with a strong peak around 250 MHz. These results confirm that Co atoms have a strong preference to enter the k2 site.
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