On the estimation of the refractive index of heavy metal oxide glasses

Abstract

The experimental values of the refractive index for more than ninety heavy metal oxide glasses are compared with those calculated using four methods: Hauser–Wenk equation (linear combination of dielectric constant), Lichtenecker logarithmic mixture rule, Wemple–DiDomenico and Lorentz–Lorenz equations. For the Lorentz–Lorenz field factor, a simple modification is suggested which relates this one to the ionicity of a glass.