Yttrium fluoride

Crystal structure
__ Y 3+      __ F -
Crystal system	orthorhombic
Space group	Pnma (No. 62)
Coordination numbers	Y [9], F [3]
General
Surname	Yttrium fluoride
other names	Yttrium trifluoride Yttrium (III) fluoride
Ratio formula	YF 3
Brief description	white solid
External identifiers / databases
CAS number 13709-49-4 EC number 237-257-5 ECHA InfoCard 100,033,855 PubChem 83679 Wikidata Q419717
properties
Molar mass	145.90 g mol −1
Physical state	firmly
density	4.0 g cm −3
Melting point	1150 ° C
boiling point	2230 ° C
solubility	almost insoluble in water, soluble in concentrated mineral acids
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-312-315-319-332-335 P: 261-280-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Yttrium fluoride is a chemical compound of yttrium from the group of fluorides with the empirical formula YF ₃ .

Extraction and presentation

Yttrium fluoride can be prepared from the reaction of fluorine with yttrium oxide or from yttrium hydroxide and hydrofluoric acid .

${\displaystyle \mathrm {Y(OH)_{3}+3\ HF\longrightarrow YF_{3}+3\ H_{2}O} }$

properties

Yttrium fluoride has a refractive index of 1.51 at 500 nm and is transparent in the range from 193 nm to 14,000 nm (i.e. from the UV to the IR range).

Pure yttrium can be obtained from yttrium fluoride by reduction with calcium .

Yttrium fluoride crystallizes in the orthorhombic crystal system , space group Pnma (space group no. 62) , with the lattice parameters a = 6.3537 Å , b = 6.8545 Å, c = 4.3953 Å. Yttrium is coordinated nine times by fluorine atoms.

use

It is used as a raw material for the production of pure yttrium or other yttrium compounds, as well as a material for thin films, glasses and ceramic materials.

Other yttrium fluorides

The compounds yttrium (I) fluoride, YF (CAS number: 13981-88-9) and yttrium (II) fluoride, YF ₂ (CAS number: 13981-89-0) are extremely unstable and only in the gas phase known.

Individual evidence

1. ↑ ^{a b c d} Web elements: Yttrium Trifluoride
2. ↑ American Elements: Yttrium Fluoride .
3. ↑ ^{a b} Data sheet Yttrium (III) fluoride from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).
4. ↑ G. Brauer (Ed.): Handbook of Preparative Inorganic Chemistry 2nd ed., Vol. 1, Academic Press 1963, p. 246.
5. ↑ General Research Institute Nonferrous Metals: YF ₃ ( Memento of September 28, 2007 in the Internet Archive )
6. ↑ AK Cheethan, N. Norman: The structures of yttrium and bismuth trifluorides by neutron diffraction. In: Acta Chemica Scandinavica , 1974 , 28 , pp. 55-60.
7. ↑ Materion Advanced Chemicals: Thorium Fluoride and Alternatives ( Memento from July 5, 2010 in the Internet Archive )
8. ↑ metall.com.cn: Yttrium Fluoride