Prediction of Averaged Refractive Index of Multicomponent Oxide Crystals by Chemical Formula

A method is proposed for estimation of mean refractive index of complex oxide crystals on the basis of nominal chemical composition. Applicability of the method has been tested for a set of ~100 inorganic oxide crystals with averaged error as low as ~5%. The method allows the design of new oxide materials with adjusted refraction index in unknown chemical systems.