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Magnesium fluoride
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Magnesium fluoride is an inorganic compound with the formula MgF2. The compound is a white crystalline salt and is transparent over a wide range of wavelengths, with commercial uses in optics that are also used in space telescopes. It occurs naturally as the rare mineral sellaite.
==Production and structure==
Magnesium fluoride is prepared from magnesium oxide with sources of hydrogen fluoride such as ammonium bifluoride:
:MgO + (NH4)HF2 → MgF2 + NH3 + H2O
Related metathesis reactions are also feasible.
The compound crystallizes as tetragonal birefringent crystals. Its structure is similar to that in rutile, featuring octahedral Mg2+ centers and 3-coordinate fluoride centres.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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