Holmium (III) fluoride

Crystal structure
__ Ho 3+      __ F -
Crystal system	orthorhombic
Space group	Pnma (No. 62)
General
Surname	Holmium (III) fluoride
other names	Holmium trifluoride
Ratio formula	HoF 3
Brief description	yellowish powder
External identifiers / databases
CAS number 13760-78-6 EC number 237-352-1 ECHA InfoCard 100,033,942 PubChem 83709 Wikidata Q2719319
properties
Molar mass	221.93 g mol −1
Physical state	firmly
density	7.64 g cm −3
Melting point	1143 ° C
boiling point	> 2200 ° C
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-311-331 P: 261-280-301 + 310-311
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Holmium (III) fluoride is an inorganic chemical compound of holmium from the group of fluorides .

Extraction and presentation

Holmium (III) fluoride can be obtained by reacting ammonium fluoride with holmium (III) oxide and thermal decomposition of the ammonium salt formed.

${\displaystyle \mathrm {Ho_{2}O_{3}+6\ NH_{4}F\longrightarrow 2\ HoF_{3}+6\ NH_{3}+2\ H_{2}O} }$

properties

Holmium (III) fluoride is a yellowish powder that is insoluble in water. It has an orthorhombic crystal system (corresponding to beta- yttrium (III) fluoride ) with the space group Pnma (space group no. 62) . However, there is also a trigonal low-temperature form of the lanthanum (III) fluoride type.

Individual evidence

1. ↑ ^{a b c d e f} Americanelements: Holmium Fluoride
2. ↑ ^{a b} Materion: Materion Advanced Chemicals Inc.  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.  
3. ↑ ^{a b} data sheet holmium (III) fluoride at AlfaAesar, accessed on August 30, 2012 ( PDF )(JavaScript required) .
4. ↑ ^{a b c} data sheet Holmium (III) fluoride, anhydrous, powder, 99.99% trace metals basis from Sigma-Aldrich , accessed on August 19, 2012 ( PDF ).
5. ^ Karl A. Gschneidner, Jean-Claude G. Bünzli: Handbook on the Physics and Chemistry of Rare Earths . Elsevier, 2003, ISBN 0-444-51323-X , pp. 202 ( limited preview in Google Book search).
6. ^ ^{A b} Christoph Janiak, Hans-Jürgen Meyer, Dietrich Gudat, Ralf Alsfasser: Riedel Modern Inorganic Chemistry . Walter de Gruyter, 2012, ISBN 3-11-024901-4 , p. 371 ( limited preview in Google Book search).
7. ↑ Boris Petrovich Sobolev: The Rare Earth Trifluorides: Introduction to materials science of ... Institut d'Estudis Catalans, 2001, ISBN 84-7283-610-X , p. 176 ( limited preview in Google Book search).
8. ^ Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists . Springer DE, 1997, ISBN 3-540-60035-3 , pp. 488 ( limited preview in Google Book search).