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01.
Barium fluoride
Molecular formula: BaF2 Molecular weight: 175.32 Property: colorless transparent cubic crystal or white powder. Soluble in hydrochloric acid, nitric acid, hydrofluoric acid and ammonium chloride solutions, as well as methanol, ethanol and other organic solvents, slightly soluble in water. The relative density is 4.83. Melting point 1368 ℃. Boiling point 2260 ℃. The refractive index (n25d) is 1.471. Moderate toxicity, LD50 (rat, oral) 250mg/kg. Application: used for manufacturing motor brushes, optical glass, optical fiber, laser generator, flux, paint agent enamel, as well as wood preservative and insecticide. Used for flux and enamel manufacturing; Used as a body preservative, solid lubricant. BaF2 crystals are used as ultraviolet or infrared windows and laser materials
02.
Calcium fluoride
Calcium fluoride Molecular formula: CaF2 molecular weight: 78.07 Application: manufacturing hydrofluoric acid. The pure product can be used as catalyst for dehydration and dehydrogenation reaction, metallurgical flux, optical glass, polishing agent for electronic materials. Properties: white powder or cubic crystal. Glows when heated. It is soluble in concentrated inorganic acids and decomposes to release hydrogen fluoride. It is slightly soluble in dilute inorganic acids and almost insoluble in water. The relative density is 3.18. MP 1402 ℃. Boiling point 2500 ℃. Low toxicity, LD50 (rat, oral) 2775mg/kg.
03.
Magnesium fluoride
Molecular formula: MgF2 molecular weight: 62.3 Application: Optical lens coating. The optical equipment is coated with a layer of magnesium fluoride film, which can reduce the reflection of the lens interface to the incoming light, reduce the halo, and improve the imaging quality. (thin film interference) In addition, magnesium fluoride is also used in ceramic and electronic industries; Manufacturing ceramics and glass; Flux for metallurgical magnesium metal; Fluorescent material of cathode ray screen; Flux, etc. Property: Colorless crystal or white powder. Rutile lattice. There is slight purple fluorescence. Very slightly soluble in water (18 ℃, 87mg/l), slightly soluble in dilute acids (especially nitric acid). The relative density is 3.18. MP 1248 ℃. Boiling point 2260 ℃. Lethal dose (guinea pig, oral) 1.0g/kg. Irritating.