Correlation between Refractive Index Dispersion Parameters and Cation Coordination Numbers in Fluoride Crystals

详细

Refractive index dispersion parameters of optical crystals of MF_n (Mⁿ⁺ = Na⁺, K⁺, Ca²⁺, Sr²⁺, Ba²⁺, Cd²⁺, Pb²⁺, La³⁺, Ce³⁺, Pr³⁺, Nd³⁺) binary fluorides have been shown to correlate with the cation coordination numbers in their structures. Using this correlation, I have demonstrated that, with increasing LaF₃ concentration, the cation coordination number in Sr_{1 −x}La_xF_{2 +x} ternary fluoride crystals (fluorite structure) increases from 8 to 11.