THE METHOD FOR DECODING TEXTURAL X-RAY DIFFRACTION DATA USING ONE DIRECT POLAR FIGURE BASED ON AN ESTIMATE OF THE CRYSTALLOGRAPHIC ORIENTATION RELIABILITY
The article deals with the express method of texture analysis using one incomplete direct polar figure (DPF). To determine the percentage and spatial position of crystallites in the test sample, a discrete DPF model is used. It is based on the Boldyreva grid with the assignment of the intensity values of the DPF to the grid nodes. The rotation of the vectors complex of the object-vector representation of the reflection planes makes it possible to find all possible orientations of the crystallites of the sample. To select the most probable orientations an algorithm for the distribution of the intensity values of the DPF between the found orientations at the nodes of a discrete model is proposed and investigated. The algorithm is based on the calculation of the factor of the orientation reliability. This factor is used to estimate the probability of having a specific orientation in the sample. The factor takes into account such parameters of the node as the intensity and the number of possible orientations. The value of the factor is sorted in descending order. Then it is used in the iterative cycle to decode the DPF. The verification of the proposed algorithm is carried out on model and real DPF. To assess the quality of the decoding a known method of computing the RP-factor is used. It allows comparing the original DPF with the reconstruction of the DPF using the obtained information on the percentage and spatial position of the crystallites in the sample. The results of processing model and real DPFs confirm the effectiveness of the proposed algorithm.