ESR IN NANOSTRUCTURED NiAl

Chinese Journal of Magnetic Resonance ›› 1997, Vol. 14 ›› Issue (4): 281-285.

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ESR IN NANOSTRUCTURED NiAl

Hou Bihui^1,2, Yi Su¹, Qin Xjaoying³, Liang Renyou⁴

1 Department of Physics, University of Science and Technology of China, Hefei 230036;
2 Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093;
3 Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031;
4 Laboratory of Structure and Analysis, University of Science and Technology of China, Hefei 230026

Received:1997-03-03 Revised:1997-03-24 Published:1997-08-05 Online:2018-01-22

Abstract

Abstract: By ESR study a size effect in nanostructured NiAl samples was found. There is no ESR signal in polycrystalline bulk NiAl alloy which only has very weak Pauli paramagnetism. The ESR signal of nanostructure NiAl (n-NiAl), whose grain size is about 8.6nm and T_C is 124K, is weakelled with the increase of temperature. When the n-NiAl.was anneled at 550℃ and 707℃, the average grain sizes of the samples are 12nm and 21nm respectively, and their ESR signals are stronger, and both samples can be attracted by a permanent magnet. There is a nonmagnetism-magnetisnl transition between polycrystalline NiAl alloy and nanostructure NiAl.

Key words: Nanostructured material, NiAl alloy, ESR, Nonmagnetism-magnetism transition

Hou Bihui, Yi Su, Qin Xjaoying, Liang Renyou. ESR IN NANOSTRUCTURED NiAl[J]. Chinese Journal of Magnetic Resonance, 1997, 14(4): 281-285.

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ESR IN NANOSTRUCTURED NiAl

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