CaF2
Calcium Fluoride
Optical Transmission
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Spectral Range: 0.13 to 9 µm
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Wave Number Range: 76,923 to 1,111 cm^-1
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Note: CaF2 is a premier material for Excimer laser optics (193 nm) and UV spectroscopy. Its low refractive index (1.399 at 5 µm) often eliminates the need for anti-reflective coatings in many infrared applications.
Solubility & Handling
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Solubility:Insoluble in water (0.0017 g / 100g at 20°C).
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Environmental Stability:CaF2 is highly resistant to humidity and does not "fog." It is extremely stable in most laboratory and industrial atmospheres.
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Chemical Stability: Resistant to most acids and alkalis. It is significantly more rugged than BaF2 or the alkali halides (NaCl/KBr).
Thermal & Mechanical Properties
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Melting Point: 1,418°C
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Thermal Shock Resistance: CaF2 has a high coefficient of thermal expansion. While more durable than Barium Fluoride, it can still fracture if subjected to extreme temperature gradients (>50°C/min).
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Mechanical Hardness: * Knoop Hardness: 158