Method of regularized multipeak reference intensity ratio for quantitative X-ray phase analysis of polycrystalline materials

The development of the regularized multipeak modification of the reference intensity ratio method (RRIR) is reported. The RRIR method consists in the simulation of the experimental X-ray pattern by a linear combination of the reference standard spectra of the identified phases taken from the PDF ICDD database, application of the regularized Tikhonov LSM and the data on quantitative elemental composition upon the optimization of the model spectrum, and harnessing of the scaling coefficients of reference spectra to calculate the phase concentrations. The peculiarities of application and accuracy of RRIR achieved in the analysis of texturized multiphase mixture of minerals used in Round Robin on QPA CPD IUCr are discussed.