In solid state chemistry, the fluorite structure refers to a common motif for compounds with the formula MX2. The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structure. Many compounds, notably the common mineral fluorite (CaF2), adopt this structure.
* The fluorite structure of calcium fluoride CaF2.
* The antifluorite structure of magnesium silicide Mg2Si.
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| - Fluorite structure (en)
- Structure fluorine (fr)
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| - In solid state chemistry, the fluorite structure refers to a common motif for compounds with the formula MX2. The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structure. Many compounds, notably the common mineral fluorite (CaF2), adopt this structure.
* The fluorite structure of calcium fluoride CaF2.
* The antifluorite structure of magnesium silicide Mg2Si. (en)
- En chimie du solide, la structure fluorine fait référence à une structure cristalline couramment rencontrée dans les composés de formule chimique MX2. Les anions X occupent les huit sites tétraédriques interstitiels tandis que les cations M occupent les sites d'une structure cubique à faces centrées (CFC). De nombreux matériaux cristallins adoptent cette structure, notamment la fluorine, constituée de fluorure de calcium CaF2.
* Fluorine CaF2.
* Siliciure de magnésium Mg2Si. (fr)
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| - In solid state chemistry, the fluorite structure refers to a common motif for compounds with the formula MX2. The X ions occupy the eight tetrahedral interstitial sites whereas M ions occupy the regular sites of a face-centered cubic (FCC) structure. Many compounds, notably the common mineral fluorite (CaF2), adopt this structure. Many compounds with formula M2X have an antifluorite structure. In these the locations of the anions and cations are reversed relative to fluorite (an anti-structure); the anions occupy the FCC regular sites whereas the cations occupy the tetrahedral interstitial sites. For example, Magnesium silicide, Mg2Si, has a lattice parameter of 6.338 Å with magnesium cations occupying the tetrahedral interstitial sites, in which each silicide anion is surrounded by eight magnesium cations and each magnesium cation is surrounded by four silicide anions in a tetrahedral fashion.
* The fluorite structure of calcium fluoride CaF2.
* The antifluorite structure of magnesium silicide Mg2Si. (en)
- En chimie du solide, la structure fluorine fait référence à une structure cristalline couramment rencontrée dans les composés de formule chimique MX2. Les anions X occupent les huit sites tétraédriques interstitiels tandis que les cations M occupent les sites d'une structure cubique à faces centrées (CFC). De nombreux matériaux cristallins adoptent cette structure, notamment la fluorine, constituée de fluorure de calcium CaF2. Les composés du magnésium de formule Mg2X, où X peut être du silicium Si, du germanium Ge, de l'étain Sn ou du plomb Pb, ont une structure dite antifluorite car la distribution des anions et des cations est inversée par rapport à celle d'une fluorine : les anions occupent les sites d'une structure CFC tandis que les cations occupent les sites interstitiels. Le siliciure de magnésium Mg2Si a un paramètre cristallin de 633,8 pm et une structure CFC dans laquelle chaque anion siliciure Si4− est entouré par huit cations de magnésium Mg2+ :
* Fluorine CaF2.
* Siliciure de magnésium Mg2Si. (fr)
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