calcium fluoride

The fluoride, CaF₂, is important to the production of hydrofluoric acid, which is made from CaF₂ by the action of sulfuric acid. CaF₂ is used in laboratory instruments as a window material for both infrared and ultraviolet radiation.

… (NaCl), rubidium-doped potassium chloride (KCl), calcium fluoride (CaF), and strontium fluoride (SrF₂) have been used for erosion-resistant infrared radomes, windows for infrared detectors, and infrared laser windows. These polycrystalline halide materials tend to transmit lower wavelengths than oxides, extending down to the infrared region; however, their grain boundaries and porosity…

Fluorite, or calcium fluoride (CaF₂), another simple halide, is found in limestones that have been permeated by aqueous solutions containing the fluoride anion. Noteworthy deposits of fluorite occur in Mexico; Cumberland, Eng.; and Illinois, Missouri, Kentucky, and Colorado in the United States.

…of optical-grade crystals, such as calcium fluoride (CaF₂), zinc selenide (ZnSe), cesium iodide (CsI), or potassium bromide (KBr), coated with silicon or germanium are employed. Below 200 cm⁻¹ Mylar films of varying thickness are used to cover narrow portions of the region.

…fluorine are (1) precipitation of calcium fluoride in the presence of sodium carbonate and treatment of the precipitate with acetic acid, (2) precipitation of lead chlorofluoride by addition of sodium chloride and lead nitrate, and (3) titration (determination of concentration of a dissolved substance) with thorium nitrate (Th[NO₃