M(o)ssbauer studies on the shape effect of Fe84.94Si9.68Al5.38particles on their microwave permeability

Han Man-Gui; Deng Long-Jiang

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M(o)ssbauer studies on the shape effect of Fe84.94Si9.68Al5.38particles on their microwave permeability

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Ball milling for long time (such as 10,20,and 30 h) can transform Fe84.94Si9.68Al5.38 alloy powders with irregular shapes into flakes.X-ray diffraction (XRD) and M(o)ssbauer measurements have proven that the unmilled particles and the flakes obtained by milling for 10 h have the same D03-type superlattice structure.The flakes obtained by milling for 20 h and 30 h have the same disorder α-Fe(Si,Al) structure.There are more than 6 absorption peaks in the transmission M(o)ssbauer spectra (TMSs) for the particles with D03-type superlattice structure,which can be fitted with 5 sextets representing 5 different Fe-site environments.However,only 6 TMS absorption peaks have been found for particles with a disorder α-Fe(Si,Al) structure,which can be fitted with the distributions of M(o)ssbauer parameters (Bhf,isomer shift).The TMS results show that the flaky particles have a stronger tendency to possess the planar magnetic anisotropy.As the result,the flakes have larger microwave permeability values than particles with irregular shapes.The conversion electron M(o)ssbauer spectra (CEMSs) also show the significantly different Fe-sites environments between the alloy surface and the inside.

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《中国物理：英文版》 |2013年第8期|380-385|共6页
作者
Han Man-Gui; Deng Long-Jiang;
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State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;

State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;

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M(o)ssbauer studies on the shape effect of Fe84.94Si9.68Al5.38particles on their microwave permeability

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