Finemet合金核外电子相互作用的多普勒展宽谱  

Extranuclear Electron Interaction of Finemet Alloy Studied by Using Doppler Broadening Spectrum of Positron Annihilation

作　　者：王宇鑫[1,2] 严彪[1,2] 赵冠楠[1,2] 邓文[3] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]上海市金属功能材料开发应用重点实验室,上海200092 [3]广西大学物理科学与工程技术学院,广西南宁530004

出　　处：《同济大学学报（自然科学版）》2009年第10期1371-1374,共4页Journal of Tongji University:Natural Science

基　　金：国家"九七三"重点基础研究发展计划资助项目(2007CB613900);国家"八六三"高技术研究发展计划资助项目(2006AA03Z301);上海市科学技术发展基金资助项目(0752nm004)

摘　　要：采用双高纯锗探头符合的正电子湮没辐射多普勒展宽谱测量了Finemet合金各组元的商谱以及在350,380,400℃下退火(10 min)的Finemet非晶薄带的商谱,对Finemet合金热处理过程中元素核外电子间的相互作用进行了研究.结果表明,Finemet合金淬火态商谱的谱峰比纯金属元素Fe,Cu,Nb的谱峰要低,Fe和Nb之间存在着3d-4d轨道键合作用.随着退火温度的升高,Fe原子的3d电子与Nb原子的4d电子之间的轨道键合作用增强,商谱谱峰降低,Cu原子易在表面富集,而Nb原子则在非晶薄带中富Fe区域里重新分布.The ratio curves of Finemet alloy elements and Finemet amorphous ribbons（annealed at 350 ℃,380 ℃ and 400 ℃ for 10min respectively）were measured with the Doppler broadening spectrum of positron annihilation which adopted two HP-Ge detector coincidence technique to investigate the extranuclear electron interaction during annealing process.Results show that the peaks of asquenched Finemet ribbons is relatively low after a comparison with the ratio curves of pure elements Nb,Fe and Cu.There exists a bonding between 3d orbit electrons in Fe atoms and 4d orbit electrons in Nb atoms. The bonding become more strengthened with the increment of annealing temperature, which leads the peaks of ratio curves to decrease. Meanwhile, the Cu atoms tend to be enriched in the surface and the Nb atoms redistribute to the amorphous layer of ribbon where the Fe atoms are rich.

关 键 词：Finemet合金 核外电子 多普勒展宽谱 

分 类 号：O795[理学—晶体学] O614