BaF2-CaF2-YF3-AlF3 Glass Systems for Infrared Transmission

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Abstract
Transparent and colorless glass rods have been obtained from the BaF2-CaF2-YF3-AlF3 system, which consists of 15 to 27 mol% BaF2, 13 to 25 mol% CaF2, 6 to 28 mol% YF3 and 37 to 50 mol% AlF3. Certain physical properties for the rods have been measured. Glass transition temperature, crystallization temperature, melting temperature and thermal expansion coefficient for 22BaF2-22CaF2-16YF3-40AlF3 glass are determined as 430°C, 535°C, 710°C and 16.5×10-6/°C for 300–400°C, respectively. The glass is transparent at 0.23–5.2 µm wavelengths, and shows a refractive index (n D) of about 1.44, density of about 4.0 g/cm3, Knoop hardness of about 360 kg/mm2, and water solubility of about 0.005 g per 100 g cold water. These glass rods have been able to be drawn into trial fibers of a few meters in length.

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