Cerium (III) fluoride

Crystal structure
__ Ce 3+      __ F -
Crystal system	hexagonal
Space group	P 6 3 / mcm (No. 193)
Coordination numbers	Ce [9], F [3]
General
Surname	Cerium (III) fluoride
other names	Cerium fluoride Cerium trifluoride
Ratio formula	CeF 3
Brief description	colorless solid
External identifiers / databases
CAS number 7758-88-5 (CeF 3 ) 55990-19-7 (CeF 3 · hydrate ) EC number 231-841-3 ECHA InfoCard 100,028,947 PubChem 522669 Wikidata Q1054573
properties
Molar mass	197.12 g mol −1
Physical state	firmly
density	6.16 g cm −3 (20 ° C)
Melting point	1460 ° C
solubility	almost insoluble in water, soluble in strong acids (e.g. sulfuric acid )
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 312 + 332-315-319-335 P: 261-280-305 + 351 + 338
Toxicological data	> 5000 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Cerium (III) fluoride is a salt of the rare earth metal cerium with hydrogen fluoride .

Extraction and presentation

Cerium (III) fluoride is obtained by reacting soluble cerium (III) chloride CeCl ₃ with hydrogen fluoride HF and then smoking the CeF ₃ with ammonium fluoride in a platinum crucible, or alternatively from cerium (IV) oxide with an excess of hydrofluoric acid.

${\displaystyle {\ce {4 CeO2 + 12 HF -> 4 CeF3 + 6 H2O + O2}}}$

properties

Physical Properties

Cer (III) fluoride has a refractive index of 1.62 (at 500 nm) and is transparent in the range from 300 to 5000 nm.

Chemical properties

Cerium (III) fluoride is insoluble, but hydrolyses slowly in water to form cerium oxide fluoride CeOF.

use

Cerium (III) fluoride is an intermediate product in the production of pure cerium (separation from other rare earth metals).

It is used:

• in oxygen- sensitive applications such as metal processing
• as part of refractory ceramics
• in the electronics industry for sputtering
• as an additive in graphite electrodes of carbon arc lamps to increase their brightness (headlights from Heinrich Beck )
• as a raw material for polishing agents and special glasses
• as a scintillator ( doped with europium ) for particle detectors in high-energy physics
• as material for anti-reflective layers
• Fluoride compounds are used in medicine in extremely low concentrations (ppm) .

See also

• Cer (II) fluoride CeF ₂ , CAS number: 22655-57-8
• Cerium (IV) fluoride CeF ₄

Individual evidence

1. ↑ ML Afanasiev, SP Habuda, AG Lundin: The symmetry and basic structures of LaF ₃ , CeF ₃ , PrF ₃ and NdF ₃ , in: Acta Cryst. , 1972, B28 , pp. 2903-2905, doi : 10.1107 / S0567740872007198 .
2. ^ ^{A b} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1942.
3. ↑ ^{a b c d} data sheet cerium (III) fluoride from Sigma-Aldrich , accessed on December 10, 2012 ( PDF ).
4. ↑ data sheet Cerium Fluoride at espimetals.com
5. ↑ G. Brauer (Ed.), Handbook of Preparative Inorganic Chemistry 2nd ed., Vol. 1, Academic Press 1963, p. 247.
6. ↑ treibacher.com: Cerfluoride product information ( Memento from May 12, 2008 in the Internet Archive )
7. ↑ testbourne.com: Cerium Fluoride CeF3 ( Memento from September 28, 2007 in the Internet Archive )
8. ↑ americanelements.com: Cerium Fluoride