A study of vacancy-type defects in amorphous and crystalline FeBSi alloys after He ion irradiation
A study of vacancy-type defects in amorphous and crystalline FeBSi alloys after He ion irradiation
复制标题
DOI：
10.1088/1742-6596/225/1/012059
复制
发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
Q. Xu;X. Z. Cao;K. Sato;T. Iwai;T. Yoshiie
中科院分区：
文献类型：
--
作者：
Q. Xu;X. Z. Cao;K. Sato;T. Iwai;T. Yoshiie
为了研究辐照过程中缺陷形成的结构依赖性，在室温下用300 keV氦离子辐照非晶Fe79B16Si5合金和晶态FeBSi合金。未辐照的非晶和晶态FeBSi合金的正电子湮没寿命几乎相等，即，124.4± 0.3ps和124.6± 0.2ps。使用正电子束测量的湮没辐射的多普勒展宽的S参数也是类似的未辐照的非晶和结晶FeBSi合金。这意味着非晶Fe 79 B16 Si 5合金自由体积处的正电子湮没并不明显。氦气照射后，多普勒增宽S参数增加。这种现象在非晶FeBSi合金中更为明显。这表明，在辐照过程中，非晶态合金中的原子比晶态合金中的原子更容易发生位移。
In order investigate the structural dependence of defect formation during irradiation, amorphous Fe79B16Si5 alloy and crystalline FeBSi alloy were irradiated by 300 keV helium ions at room temperature. Positron annihilation lifetimes observed for the unirradiated amorphous and the crystalline FeBSi alloys were nearly equal, i.e., 124.4±0.3 ps and 124.6±0.2 ps, respectively. The S parameters of the Doppler-broadening of annihilation radiation measured using a positron beam were also similar for the unirradited amorphous and crystalline FeBSi alloys. It means that the positron annihilation at the free volume in amorphous Fe79B16Si5 alloy is not prominent. The Doppler-broadening S parameter increased after the helium irradiation. This phenomenon was more pronounced in the amorphous FeBSi alloy. It suggests that the atoms are more easily displaced in amorphous alloy than in crystalline alloy during irradiation.