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第一性原理研究具有原子无序的Co_2FeSi合金的电子结构、磁性与半金属特性(英文)
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作者 魏雪超 李冠男 金迎九 《延边大学学报(自然科学版)》 CAS 2010年第2期136-141,共6页
应用全势线性缀加平面波方法,并结合GGA+U方案,研究了原子无序性对full-Heusler合金Co2FeSi的电子性质和磁性质的影响.在full-Heusler合金Co2FeSi中,本文考虑了Co-Fe,Co-Si和Fe-Si 3种类型的原子无序.通过研究发现Fe-Si原子无序体系的... 应用全势线性缀加平面波方法,并结合GGA+U方案,研究了原子无序性对full-Heusler合金Co2FeSi的电子性质和磁性质的影响.在full-Heusler合金Co2FeSi中,本文考虑了Co-Fe,Co-Si和Fe-Si 3种类型的原子无序.通过研究发现Fe-Si原子无序体系的总能量在3种原子无序当中最低,并且在U15~U20的范围内,Fe-Si原子无序体系依然保持半金属特性;另外,Co-Fe原子无序和Co-Si原子无序体系具有较高的总能量,这2种原子无序对体系的电子性质和磁性质产生了很大的影响,并且完全破坏了Co2FeSi的半金属特性. 展开更多
关键词 半金属铁磁体 原子无序性 全势线缀加平面波(FLAPW)方法
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Characteristic atom sequences of Nb-Mo alloys system in BCC structure and properties of disordered alloys
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作者 彭红建 武青 +1 位作者 李小波 谢佑卿 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1190-1196,共7页
Comprehensively considering energy, volume and electronic structure of alloys, the ninth equation was determined as the interaction function of Nb-Mo alloys system in BCC structure on the basis of idea of systematic s... Comprehensively considering energy, volume and electronic structure of alloys, the ninth equation was determined as the interaction function of Nb-Mo alloys system in BCC structure on the basis of idea of systematic science of alloys, experimental lattice constants and heats of formation of disordered Nb(1-x)Mox alloys. The structural parameters and properties of Nb and Mo characteristic atoms sequences and corresponding characteristic crystals sequences were determined in Nb-Mo alloys system. The electronic structure and physical properties of disordered Nb(1-x)Mox alloys system were calculated according to concentration of characteristic atoms of disordered alloys. The change trend of physical properties is the same as that of electronic structure. 展开更多
关键词 Nb-Mo alloys system characteristic atom sequences disordered alloys properties
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