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| MAGNETISM TRANSITION IN NiAl POLYCRYSTAL-NANOCRYSTAL |
| HOU Bihui;YI Su; QIN Xiaoying;SHEN Baogen; JI Xiaoli; ZHANG Lide(University of Science and Technology of China; Hefei; 230026)(State Key Laboratory of Magnetism; Institiste of Physics; Chinese Academy of Sciences; Beijing; 100080)(Institute of Solid State Physics; Chinese Academy of Sciences; Hefei 230031)(Manuscript received 1996-04-09; in revised form 1996-07-01) |
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Cite this article:
HOU Bihui;YI Su; QIN Xiaoying;SHEN Baogen; JI Xiaoli; ZHANG Lide(University of Science and Technology of China; Hefei; 230026)(State Key Laboratory of Magnetism; Institiste of Physics; Chinese Academy of Sciences; Beijing; 100080)(Institute of Solid State Physics; Chinese Academy of Sciences; Hefei 230031)(Manuscript received 1996-04-09; in revised form 1996-07-01). MAGNETISM TRANSITION IN NiAl POLYCRYSTAL-NANOCRYSTAL. Acta Metall Sin, 1997, 33(4): 427-431.
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Abstract The magnetism of bulk polycrystal NiAl and nanostructural NiAl with various grain diameter was studied. The susceptibility of a bulk polycrystal NiAl X is about 3.0×10-3 / g, its specific magnetization σ has almost not change with temperature. The σof as condensed nanostructural NiAl samples with average grain size of 8.6 nm, diminishes obviously with the increase in temperature at a range of 1.5 -150 K, from tis σ-T curve we get the Curie temperature TC of the sample being about 124 K. Other three samples obtained by annealed the condensed NiAl samples at various temperatures have average grain sizes of 12,18 and 21 nm, their a are two orders of magnitude larger than that of the bulk polycrystal NiAl, change slightly with temperature at range of 1.5-300 K. The experimental results indicate that there exists nonmagnetism-magnetism transition between polycrystal NiAl alloy and nanostructural NiAl.
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Received: 18 April 1997
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