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| MOSSBAUER SPECTROSCOPIC STUDY OF Nd-Fe-B PERMANENT MAGNETIC ALLOY |
| by QIAN Xiangrong; JIN Huijuan; XU Guiqin; WU Lianghong; ZHEN Yi (Shanghai Institute of Iron and Steel Reseaerch) |
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Cite this article:
by QIAN Xiangrong; JIN Huijuan; XU Guiqin; WU Lianghong; ZHEN Yi (Shanghai Institute of Iron and Steel Reseaerch). MOSSBAUER SPECTROSCOPIC STUDY OF Nd-Fe-B PERMANENT MAGNETIC ALLOY. Acta Metall Sin, 1986, 22(3): 71-75.
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Abstract The permanent magnets of the nominal composition Nd_xB_yFe(100-x-y) with x=15 or 16 and y=4-10 were investigated by means of Mossbauer effect. The Mossbauer spectra may be resolved into the subspectra corresponding to the different phases. Mossbauer measurements show that the constituent phases of the alloy are varied with its B content. The α-Fe and Nd_2Fe_(17) are observed in the alloy without B; the tetragonal Nd_2Fe_(14)B occurs and Nd_2Fe_(17) disappears in that containing 4 at.-%B; the Nd-rich and B-rich phases in addition to Nd_2Fe_(14)B exist and α-Fe vanishes in that up to 7 at.-%B and the B-rich phase tends to increase predominantly while further increasing the B content. Six subspectra of the tetragonal phase correspond to the six non-equivalent Fe sites. It is pointed Out that j_2 site posseses maximum hyperfine field and also maximum quadruple splitting. The preferential occupation of j_2 site by Fe atoms is critical for establishing the high anisotropy and remanence.
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Received: 18 March 1986
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| 1 Herbst, J. F.; Croat, J.J.; Pinkerton, F.E.; Yelon, W.B., Phys. Rev., B 29 (1984) , 4176． |
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