The configuration of atomic defects as determined from scattering studies
The configuration of atomic defects as determined from scattering studies
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DOI：
10.1016/0022-3115(78)90244-1
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发表时间：
1978-02
影响因子：
3.1
通讯作者：
P. Ehrhart
中科院分区：
文献类型：
--
作者：
P. Ehrhart
晶体固体中的原子缺陷，如空位和杂质，会产生X射线或中子的弹性漫散射。漫散射强度在倒易空间中的分布包含了点缺陷原子结构的直接信息，灵敏地反映了缺陷团簇的形成。散射的三个域被区分为：（a）在前向方向上的散射（小角度散射）;（B）布拉格反射之间的散射;以及（c）靠近布拉格反射的散射（黄散射）。讨论了从不同领域的测量中获得的信息的具体特征。对面心立方结构的Al和Cu，体心立方结构的Mo和六方结构的Zn进行了低温电子辐照后金属中晶体结构的实验研究。在其它金属（Au，Nb，Cd，Mg）中，在5 K的电子辐照过程中观察到晶体的团聚。
Atomic defects such as vacancies and interstitials in crystalline solids produce elastic diffuse scattering of X-rays or neutrons. The distribution in reciprocal space of the diffuse scattering intensity contains very direct information about the atomic structure of point defects, and it sensitively shows the formation of defect clusters. Three domains of the scattering are distinguished: (a) scattering in the forward direction (small-angle scattering); (b) scattering between the Bragg reflections; and (c) scattering close to the Bragg reflections (Huang scattering). The specific features of the information obtained from measurements in the different domains are discussed. Experimental results on the structure of interstitials in metals have been obtained after low temperature electron irradiation of the fcc metals Al and Cu, bcc Mo, and hcp Zn. In other metals (Au, Nb, Cd, Mg) the agglomeration of interstitials was observed during electron irradiation at 5 K.