摘要
在激光功率为 40— 1 60W、扫描速度为 1 0mm s、激光光斑为 2 0mm照射条件下 ,用CO2 激光辐照非晶Fe73 5Cu1 Nb3 Si1 3 5B9产生微量晶化 .利用透射穆斯堡尔谱 (TMS)技术分析了原始态和晶化后样品的超精细结构 .确定了穆斯堡尔谱的基本参数———化学位移 (IS)、四极分裂 (QS)、内磁场 (Hhf)随激光功率变化的规律 .分析表明 ,CO2 激光处理后的Fe73 5Cu1 Nb3 Si1 3 5B9非晶微量晶化提高了非晶相平均超精细磁场强度 .微量晶化相是Fe Si以DO3 结构存在 ,其谱线面积占 2 %— 3 4% ,Fe Si相中Fe原子 3d6壳层上的 1个电子跳到Si原子 3p2 壳层上形成了稳定电子组态 .
Microcrystalline phases were produced by laser irradiation on the Fe 73 5C u 1Nb 3Si 13 5B 9 amorphous ribbon with a power ranging from 40 to 170 W,scaning speed 10?mm/s,laser beam spot 20?mm. Hyperfine structures of the ori gina l and crystallized samples were analyzed by transmission Mssbauer spectroscopy . We discovered that the basic parameters of the Mssbauer spectra——isomer shi f t(IS), quadrupole splitting(QS) and hyperfine magnetic field(Hhf) change w ith the laser power. Experimental results show that the magnetic moment reorgani zation of Fe 73 5Cu 1Nb 3Si 13 5B 9 amorphous phases has taken pl ace and the atom magnetic moment direction maintains a preferred in-plane orien tation, The average hyperfine magnetic field of the amorphous phase is improved because of the microcrystalline phase. The crystallized phase was Fe-Si alloy w ith a DO 3 structure, and the area of its spectral lines is about 2%—3 4% . Th is is caused by the jump of one electron in Fe atom 3d 6 shell into Si atom 3p 2 shell, forming a stability electron group.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第10期2486-2491,共6页
Acta Physica Sinica
基金
国家自然科学基金 (批准号:59972 0 0 4 )
教育部跨世纪人才基金资助的课题~~
