Chemistry:Holmium(III) fluoride
From HandWiki
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3D model (JSmol)
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| Properties | |
| 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 pictograms |  
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| GHS Signal word | Danger |
| H301, H311, H315, H319, H331, H335 | |
| P261, P264, P270, P271, P280, P301+310, P302+352, P304+340, P305+351+338, P311, P312, P321, P322, P330, P332+313, P337+313, P361, P362, P363, P403+233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Holmium(III) fluoride is an inorganic compound with a chemical formula of HoF3.
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]
- Ho
2O
3 + 6NH
4F ⟶ 2HoF
3 + 6NH
3 + 2H
2O
It can also be prepared by directly reacting holmium with fluorine:[4]
- 2Ho + 3F
2 → 2HoF
3
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
- ↑ 1.0 1.1 "Holmium Fluoride". https://www.americanelements.com/holmium-fluoride-13760-78-6.
- ↑ 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.
- ↑ 3.0 3.1 Janiak, Christoph; Meyer, Hans-Jürgen; Gudat, Dietrich; Alsfasser, Ralf (2012-01-27) (in de). Riedel Moderne Anorganische Chemie. Walter de Gruyter. ISBN 978-3-11-024901-9. https://books.google.com/books?id=bW7cxciPCv4C&pg=PA371.
- ↑ "Chemical reactions of Holmium". Webelements. https://www.webelements.com/holmium/chemistry.html.
- ↑ Holmium(III) fluoride at AlfaAesar, accessed on 2023-12-22 (PDF) (JavaScript required).
- ↑ 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.
- ↑ Ans, Jean d'; Lax, Ellen (1998) (in de). Taschenbuch für Chemiker und Physiker. Springer. ISBN 978-3-540-60035-0. https://books.google.com/books?id=ssy59etLaksC&pg=PA488.
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