It is shown that the refractive indices of two-component M 1-x R x F2+x crystals (M = Ca, Sr, Ba, Cd, Pb; R = La-Lu, Y; 0 ≤ x ≤ 0.5) can be calculated with a rather high accuracy in a wide spectral range (depending on the rare-earth-element content) using molecular refraction additivity for the components.
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Константинова et al. (2010) studied this question.
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