Growth of Fluorite Solid Solution Crystals in the Ternary SrF2–BaF2–LaF3 System and Investigation of Their Properties

Resumo

A series of three-component isostructural fluorite crystals (Sr_1–xBa_x)_0.7La_0.3F_2.3 (sp. gr. \(Fm{\bar {3}}m\), 0 ≤ x ≤ 1), the compositions of which belong to the Sr_0.7La_0.3F_2.3–Ba_0.7La_0.3F_2.3 polythermal section in the SrF₂–BaF₂–LaF₃ system, has been grown for the first time by vertical directional crystallization. Optical, mechanical, and electrical properties of three-component (Sr_1–xBa_x)_0.7La_0.3F_2.3 and two-component M_0.7La_0.3F_2.3 (M = Sr or Ba) crystals have been investigated and subjected to comparative analysis. It is shown that all three-component crystals (Sr_1–xBa_x)_0.7La_0.3F_2.3 are promising optical design materials.