Method of estimating preferred orientation of polycrystalline material

摘要

The method estimates quantitatively the preferred orientation of a polycrystalline material using one diffraction peak. An orientation density distribution function rho is assumed to be axisymmetric around on the normal direction of the surface of a sample made of a polycrystalline material. The function rho may be a Gaussian function or a March-Dollase function. An X-ray is incident upon the surface of the sample at an incident angle alpha and the intensity of a diffraction X-ray is measured. The change of the intensity of the diffraction X-ray is measured with the incident angle alpha being changed to attain a measurement rocking curve. On the other hand, a theoretical diffraction X-ray intensity is calculated based on the orientation density distribution function rho. Then the characteristic parameter of the function rho is determined so that the theoretical rocking curve approaches the measurement rocking curve as closely as possible, whereby the orientation density distribution function rho can be determined. The degree of preferred orientation can be quantitatively estimated.