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fluorite structure |
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The structure shown in the diagram, which is one of the most important for compounds of stoichiometry AB{TAG(tag=>sub)}2{TAG}, named after fluorite, CaF{TAG(tag=>sub)}2{TAG}, the main mineral source of fluorine. It consists of a face-centred cubic array of calcium ions together with fluoride ions in all the tetrahedral holes. The antifluorite structure, with the cation and anion positions swapped, is also common, as in the alkali metal oxides such as Na{TAG(tag=>sub)}2{TAG}O.
{img src=show_image.php?name=image_06_09.gif } |
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| Other Terms : sulphurous acid (sulphuric(IV) acid) | chip | nonstoichiometric compound
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