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在非晶态材料的理论研究中一直存在着两种结构模型,无序密堆硬球模型和微晶无序模型.从实验角度定非晶态材料最可能的结构是非晶态研究工作的基础.由于正电子湮灭方法对缺陷特别灵敏,它所提供的三个基本信息——正电子寿命谱,正电子湮灭多普勒展宽谱和正电子湮灭角关联曲线,是验证这两种理论的有用的信息.如果非晶态材料是由微晶构成,其晶相与非晶的寿命,角关联曲线的归一化峰值计数必然有大的差异,反之则不然.
There are two kinds of structural models, disorderly close-packed hard-sphere model and microcrystal disordered model in the theoretical research of amorphous materials.From the experimental point of view, the most probable structure of amorphous materials is the basis of amorphous state research. Since the positron annihilation method is particularly sensitive to defects, the three basic information it provides - positron lifetime, positron annihilation Doppler broadening and positron annihilation angle - are useful information to verify both theories If the amorphous material is composed of crystallites, the normalized peak counts for the angular dependence curves will inevitably differ greatly from their crystalline and amorphous lifetimes, and vice versa.