Quantitative X-Ray Diffraction Analysis of Electrolytes by the Method of Standards and Rietveld Method

Abstract

Comparative analysis of the characteristics of electrolytes obtained using chemical analysis and x-ray diffraction technique by the method of standards and Rietveld method is carried out. The reliability of the method of standards is confirmed in the course of quantitative analysis of electrolytes from several factories using domestic diffractometers “DIFRAY-402.” Data of quantitative phase analysis (method of standards and Rietveld method) of lithium-free electrolyte samples with a cryolite ratio CR < 2,5 correlate well with the results of chemical analysis. For potassium and lithium-containing electrolytes with CR > 2,5 the determined phase composition differs from the real one because the thorium method usually overestimates CR, whereas the standard way of cryolite ratio calculation leaves out sodium containing in potassium and lithium phases.