Holmium(III) fluoride

Holmium(III) fluoride is an inorganic compound with a chemical formula of HoF₃.

Holmium(III) fluoride

Identifiers
CAS Number	13760-78-6 Y
3D model (JSmol)	Interactive image
ChemSpider	75531
ECHA InfoCard	100.033.942
EC Number	237-352-1
PubChem CID	83709
UNII	XU9F7TR3LU Y
CompTox Dashboard (EPA)	DTXSID3065611
InChI InChI=1S/3FH.Ho/h3*1H;/q;;;+3/p-3 Key: FDIFPFNHNADKFC-UHFFFAOYSA-K
SMILES F[Ho](F)F
Properties
Chemical formula	HoF3
Molar mass	221.93
Appearance	yellowish powder
Density	7.64g/cm3[1]
Melting point	1145 °C[2]
Boiling point	>2200 °C[1]
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H315, H319, H331, H335
Precautionary statements	P261, P264, P270, P271, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Holmium(III) fluoride can be produced by reacting holmium oxide and ammonium fluoride, then crystallising it from the ammonium salt formed in solution:^[3]

Ho₂O₃ + 6NH₄F ⟶ 2HoF₃ + 6NH₃ + 2H₂O

It can also be prepared by directly reacting holmium with fluorine:^[4]

2Ho + 3F₂ → 2HoF₃

Properties

Holmium(III) fluoride is a yellowish powder that is insoluble in water.^[5] It has an orthorhombic crystal system (corresponding to β-YF₃^[6]) with the space group Pnma (space group no. 62).^[7] However, there is also a trigonal low-temperature form of the lanthanum(III) fluoride type.^[3]

References

1. "Holmium Fluoride".
2. Shaimuradov, I. B.; Reshetnikova, L. P.; Novoselova, A. V. Phase diagram of the potassium fluoride-holmium fluoride system. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, 1974. 10 (8). 1468-1471. ISSN 0002-337X.
3. Janiak, Christoph; Meyer, Hans-Jürgen; Gudat, Dietrich; Alsfasser, Ralf (2012-01-27). Riedel Moderne Anorganische Chemie (in German). Walter de Gruyter. ISBN 978-3-11-024901-9.
4. "Chemical reactions of Holmium". Webelements. Retrieved 2009-06-06.
5. Holmium(III) fluoride at AlfaAesar, accessed on 2023-12-22 (PDF) (JavaScript required).^{[dead link]}
6. Sobolev, Boris P. (2001). The rare earth trifluorides Introduction to materials science of multicomponent metal fluoride crystals. Arxius de les seccions. Barcelona: Institut d'Estudis Catalans. ISBN 978-84-7283-610-5.
7. Ans, Jean d'; Lax, Ellen (1998). Taschenbuch für Chemiker und Physiker (in German). Springer. ISBN 978-3-540-60035-0.