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Cerium(III) fluoride

Names
IUPAC name Cerium(III) fluoride
Other names Cerium trifluoride
Identifiers
CAS Number	7758-88-5
ChemSpider	22865
ECHA InfoCard	100.028.947
EC Number	231-841-3
PubChem CID	24457
UNII	1GCT2G09AN
CompTox Dashboard (EPA)	DTXSID8052516
Properties
Chemical formula	CeF3
Molar mass	197.12 g/mol
Density	6.16 g/cm (at 20 °C)
Melting point	1,460 °C (2,660 °F; 1,730 K)
Related compounds
Related compounds	Lanthanum trifluoride
Hazards
GHS labelling:
Pictograms
NFPA 704 (fire diamond)	3 0 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

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. CeF₃ may be used as a Faraday rotator material in the visible, near-infrared and mid-infrared spectral range.

Structure

The crystal structure of cerium(III) fluoride is described as the LaF₃ or tysonite structure. It contains 9-coordinate cerium ions that adopt an approximately tricapped trigonal prismatic coordination geometry, although it can be considered 11-coordinate if two more distant fluorides are considered part of the cerium coordination environment. The three crystallographically independent fluoride ions are 3-coordinate and range in geometry from trigonal planar to pyramidal.

Coordination in cerium(III) fluoride

Cerium coordination	Fluorine F1 coordination	Fluorine F2 coordination	Fluorine F3 coordination

References

1. Holleman-Wiberg, 102. edition, p. 1942
2. "Fluocerite-(Ce)".
3. "List of Minerals". 21 March 2011.
4. Vojna, David; Yasuhara, Ryo; Slezák, Ondřej; Mužík, Jiří; Lucianetti, Antonio; Mocek, Tomáš (2017). "Verdet constant dispersion of CeF3 in the visible and near-infrared spectral range". Optical Engineering. 56 (6): 067105. Bibcode:2017OptEn..56f7105V. doi:10.1117/1.oe.56.6.067105. S2CID 125990210.
5. Vojna, David; Slezák, Ondřej; Yasuhara, Ryo; Furuse, Hiroaki; Lucianetti, Antonio; Mocek, Tomáš (2020). "Faraday Rotation of Dy2O3, CeF3 and Y3Fe5O12 at the Mid-Infrared Wavelengths". Materials. 13 (23): 5324. Bibcode:2020Mate...13.5324V. doi:10.3390/ma13235324. PMC 7727863. PMID 33255447.
6. ^ Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. pp. 420–421. ISBN 978-0-19-965763-6.
7. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1240–1241. ISBN 978-0-08-037941-8.
8. Cheetham, A. K.; Fender, B. E. F.; Fuess, H.; Wright, A. F. (1976). "A powder neutron diffraction study of lanthanum and cerium trifluorides". Acta Crystallogr. B. 32: 94–97. doi:10.1107/S0567740876002380.

• Cerium(III) compounds
• Fluorides
• Lanthanide halides