Cu-Zr,Cu-Ti非晶态合金原子近邻结构的EXAFS研究

本工作用EXAFS技术测定了非晶态合金Cu_XZr_1-X（X=33,50）和Cu₈₀Ti₂₀中Cu原子K吸收EXAFS谱,得出了原子间距和配位数等结构参数。本文通过对上述非晶态合金EXAFS数据的分析,给出了Cu_XZr_1-X和Cu_XTi_1-X体系中化学短程有序的研究结果。当Cu原子含量为50%时,体系中不显示化学短程有序,Cu原子的含量增加,此类非晶态合金中异类原子趋子互相结合;Cu原子的含量低于50%时,同类原子倾向于互相结合。

EXAFS Study of Local Structure in Amorphous Alloys Cu-Zr,Cu-Ti

The Cu K edge EXAFS of amorphous alloy Cu_xZr_1-x(X=33,50) and Cu₈₀ Ti₂₀ were measured.The structural parameters such as distance between atoms and coordination numbers were obtained. In this paper,investigation of the chemical short range order in the systems of Cux Zr1-x and CuxTi1-x is carried out,and the results are presented.There is no chemical short range order ia 50 at% Cu alloy,while increasing the copper content in this kind of systems increases the tendency to order with unlike atoms and decreasing the copper content willincrease the tendency to order with like atoms.