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中国物理学会期刊

二元晶体中缺陷所引起的位移畴

CSTR: 32037.14.aps.33.202

THE DISPLACEMENT DOMAINS CAUSED BY DEFECTS IN BINARY CRYSTALS

CSTR: 32037.14.aps.33.202
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  • 借助于应变晶体的弹性偶极子模型,把二元晶体中的每一个原子都视为一弹性偶极子。它们有不同的等效偶极矩,在晶体内其他强内应力源,如位错、包裹物等所产生的应力场中受到不同的作用力,因而产生不同的位移,形成了不同形状的畴。它决定于永久偶极矩及感生偶极矩的相对大小和内应力源所产生的应力场的分布。本文分别给出了二元晶体中在刃位错、螺位错、包裹物和挤列等的应力场作用下出现的畴图样。它们呈各种形式排列的花瓣状图形。在适当的条件下,它们可以被观察到。结果还表明了压力对相变的影响。

     

    By using the elastic dipole model of strained crystals, we regard every atom in a binary crystal as an elastic dipole, which has various effective moment. On various kinds of atoms, different force will be acted by the stress field due to other stronger internal stress sources such as dislocation, inclusion, etc. Thus different displacement will take place and some domains of various shape depending on the relative magnitude of permanent moment and induced moment will form. In the present paper, the domain patterns produced by internal stress field of edge dislocation, screw dislocation, inclusion and crowdion are obtained by calculation, they look like rosettes Under proper condition the patterns of these domains might be observed. The result also shows the effect of pressure on phase transition.

     

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