2H-ZnS单晶层错几率的旋进法测定中影响因素的研究

作者首次使用X光旋进照相法测定了2H-ZnS单晶rp的层错组态和层错几率.并对测定方法中的符种影响因素进行了研究:比较了两种“定向”方法(定向照相法和锥轴照相法),指出了它们各自的适用条件;分析了倒易点阵面“定向”偏差对衍射强度分布的影响;研究了反射时问对衍射强度分布的影响,征明罗伦兹-偏振修正的必要性.同时对测定方法中其他应注意的问题也进行了讨论.

STUDY OF THE FACTORS AFFECTING DETERMINA-TION OF THE STACKING FAULT PROBABILITY IN SINGLE CRYSTAL ZnS BY PRECESSION PHOTOGRAPHY

Using X-ray precession photography method, the stacking fault configu-rations and their probability in single crystal ZnS have been determinated first in present paper1]. In this paper,some factors affecting precession measurement have been studied and the results are represented as follows.(1) The comparison between the orientafion-photography and the cone-axis-photography to determinate the crystal orientation have been carried out experimently. When the size of cross section in ZnS single crystal is 0.1 to 0.2mm, the orientation-photography is available, while the specimen is very small, the cone-axis-photography will be adoptabie for this purpose.(2) The influences of crystal orientation deviation on intensity distribution on the plane of reciprocal lattice have been studied. When the b axis deviates from the vertical direction in about 1º, the reflection spots en (10·l) row located at zero-level a*c* of the reciprocal lattice are splitted. Whenthe deviation of the b axis is 0.5º, the reflection spots are not splitted butit influences the profile of intensity distribution. While the deviation is 0ºapproximately (about 7'' in experiment), where the b axis is almost theprecession axis, the profile of the intensity distribution is symmetric alongc* direction.(3) The influences of time-of-reflection on the intensity distribution of (10·l) row on zero-level a*c* precession photography have been investigated. After Lorentz-polarization correction carried out, the profile of intensity distribution is variated obviously, as a result the values of integrated width of the (10·l) row are affected by Lorentz-polarization correction, which indicates that this correction is necessary in analysis.Other related factors, such as background, overlap, double-spots and absorption effects, which should be noted in the precession photography experiments, are also discussed.