王文采
,
陈玉
金属学报
用X射线K吸收谱方法研究了Fe_xGe_(1-x)(x=8.7,19.1和28.5％)非晶薄膜的短程序结构。三种合金中,Ge或Fe原子的最近邻结构组态均由Ge,Fe分别形成的两个间距很小的双配位层构成。Fe含量较低的前两种合金,Ge的最近邻结构参数与非晶Ge非常相近,Fe作为Ge的最近邻原子接近于无规的代位式配位。当Fe含量达到28.5at.-％时,相应的非晶薄膜的短程序发生了很大的变化;非晶已偏离连续无规网络结构,显示出朝无规密堆结构变化的趋向。同时,还显示出在该合金中Fe-Ge原子间存在较强的相互作用。
关键词:
铁—锗非晶薄膜
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X-ray short-range order structure
WANG Wencai CHEN Yu Peking University
,
Beijing
,
China Associate Professor
,
Dept.of Physics
,
Peking University Beijing
,
China
金属学报(英文版)
The short-range order structures of Fe_xGe_(1-x) amorphous thin films,(x=8.7,19.1 and 28.5%)have been studied by means of X-ray absorption spectrum.The nearest neighbors around a Ge or an Fe atom are constituted by two coordinate sub-shells with a very short dis- tance,In two films with lower Fe content,structural parameters of the nearest neighbors around a Ge atom are very near to that in amorphous germanium,and the positions of Fe at- oms are randomly substitutional.But when x=28.5%,some great changes occur on the short-range order structure of a-Fe_xGe_(1-x) film:its structure deviates from continuous ran- dora network and tends toward dense random packing of atoms.Meanwhile,there is a strong- er interaction between near neighboring Fe-Ge atoms in a-Fe_xGe_(1-x) films.
关键词:
Fe-Ge amorphous thin film
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