Английская Википедия:Cerium(III) fluoride
Cerium(III) fluoride (or cerium trifluoride), CeF3, is an ionic compound of the rare earth metal cerium and fluorine.
It appears as a mineral in the form of fluocerite-(Ce) - a very rare mineral species related mainly to pegmatites and rarely to oxidation zones of some polymetallic ore deposits.[1][2] CeF3 may be used as a Faraday rotator material in the visible, near-infrared and mid-infrared spectral range.[3][4]
Structure
The crystal structure of cerium(III) fluoride is described as the [[Lanthanum trifluoride|Шаблон:Chem2]] or tysonite structure.[5] It contains 9-coordinate cerium ions that adopt an approximately tricapped trigonal prismatic coordination geometry,[6] although it can be considered 11-coordinate if two more distant fluorides are considered part of the cerium coordination environment.[5] The three crystallographically independent fluoride ions are 3-coordinate and range in geometry from trigonal planar to pyramidal.[5]
| Cerium coordination | Fluorine F1 coordination | Fluorine F2 coordination | Fluorine F3 coordination |
|---|---|---|---|
| Файл:Cerium(III)-fluoride-xtal-Ce-coord-3D-bs-17.png | Файл:Cerium(III)-fluoride-xtal-F1-coord-3D-bs-17.png | Файл:Cerium(III)-fluoride-xtal-F2-coord-3D-bs-17.png | Файл:Cerium(III)-fluoride-xtal-F3-coord-3D-bs-17.png |
References
Шаблон:Reflist Шаблон:Cerium compounds Шаблон:Fluorides Шаблон:Lanthanide halides
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-fluoride-xtal-F1-coord-3D-bs-17.png){kind=link}
-fluoride-xtal-F2-coord-3D-bs-17.png){kind=link}
-fluoride-xtal-F3-coord-3D-bs-17.png){kind=link}