| Fe-Al系统磁性及其压力效应 |
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| 引用本文： | 段素青,刘绍军,马本堃.Fe-Al系统磁性及其压力效应[J].物理学报,1999,48(7):1346-1353. |
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| 作者姓名： | 段素青 刘绍军 马本堃 |
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| 作者单位： | (1)北京师范大学物理系，北京 100875; (2)北京应用物理与计算数学研究所，北京 100080 |
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| 基金项目： | 国家攀登计划（批准号：95-yu-41)及高等学校博士学科点专项科研基金(批准号：9600273)资助的课题. |
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| 摘 要： | 采用紧束缚线性muffin-tin轨道方法，研究了Fe-Al系统的磁性与Al组分的关系及其压力效应. bcc Fe-Al合金的铁磁磁矩随Al组分增大而单调减小，且会出现Al组分引起的铁磁—顺磁相变. bcc Fe-Al合金的铁磁磁矩随体积压缩单调减小，但与γ-Fe及某些fcc铁基合金不同的是bcc Fe-Al合金不会出现压力诱导的铁磁—顺磁相变.计算结果与实验符合.
关键词：
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| 关 键 词： | 铁铝系统 磁性 压力效应 铁基合金 |
| 收稿时间： | 1998-03-19 |
THE MAGNETISM AND ITS PRESSURE DEPENDENCE OF Fe-Al SYSTEM |
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| DUAN SU-QING,LIU SHAO-JUN and MA BEN-KUN.THE MAGNETISM AND ITS PRESSURE DEPENDENCE OF Fe-Al SYSTEM[J].Acta Physica Sinica,1999,48(7):1346-1353. |
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| Authors: | DUAN SU-QING LIU SHAO-JUN and MA BEN-KUN |
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| Abstract: | Using the tight-binding linear muffin-tin orbital(TB-LMTO) method, we investigated the magnetism and its pressure dependence of Fe-Al system in some bcc superstructures. The results indicate that the magnetic moment of Fe in the ferromagnetic state decreases with increasing concentration of Al in the system and the volume-compression. As the concentration of Al in the system is in excess of about 0.5 the magnetism of the system will transform from ferromagnetism to paramagnetism. On the other hand, there are no pressure-induced magnetic phase transitions in the bcc Fe-Al alloys; this is different from that in the fcc Fe(γ-Fe) and some fcc Fe-based alloys. The results are in good agree-ment with the experimental results. |
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