•With high quality data, you can determine how much of each phase is present

• –must meet the constant volume assumption (see later slides)

•The ratio of peak intensities varies linearly as a function of weight fractions for any two phases in a mixture

• –need to know the constant of proportionality

•RIR method is fast and gives semi-quantitative results

•Whole pattern fitting/Rietveld refinement is a more accurate but more complicated analysis