Abstract
The alkaline earth metals from group IIA of the periodic table form highly ionic salts with fluorine in the combination MF2. Because of their wide band gaps, low refractive indices, reasonable hardness and low deliquescence relative to other halides, the Alkaline Earth Fluorides (AEF) are widely used in optical coatings and find special utility for transmissive components in the deep ultraviolet. The crystals are composed of neon-like F ions electrostatically bonded with either Ne-like Mg2+, Ar-like Ca2+, Kr-like Sr2+, or Xe-like Ba2+ in a close-packed lattice which has the rutile structure for MgF2 and the cubic fluorite structure for CaF2, SrF2, and BaF2. Except for the much larger cohesive energy of ionic bonding, these materials are not so different from the rare-gas solids discussed in the last chapter.
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Song, K.S., Williams, R.T. (1993). Alkaline Earth Fluorides. In: Self-Trapped Excitons. Springer Series in Solid-State Sciences, vol 105. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-97432-8_4
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DOI: https://doi.org/10.1007/978-3-642-97432-8_4
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