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calcium fluoride |
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calcium fluoride [′kal·sē·əm ′flu̇r‚īd] (inorganic chemistry) CaF2Colorless, cubic crystals that are slightly soluble in water and soluble in ammonium salt solutions; used in etching glass and preparing hydrofluoric acid. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Calcium fluoride from wastewater is collected and reused to make cement. The refractive index, dispersion, and thermo-optic coefficient of the lens materials, commonly fused silica for the 193 nm stepper and calcium fluoride for the 157 nm stepper, have to be accurately determined to allow optical engineers to model the diffraction-limited exposure patterns. But since glass absorbs more UV radiation as the wavelength shrinks, stepper makers have begun using nonabsorbing crystals such as calcium fluoride in the machine's optical components. |
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