Holmium(III) fluoride
Chemical compound
From Wikipedia, the free encyclopedia
Holmium(III) fluoride is an inorganic compound with a chemical formula of HoF3.
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.942 |
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PubChem CID |
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CompTox Dashboard (EPA) |
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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 labelling: | |
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| Danger | |
| H301, H311, H315, H319, H331, H335 | |
| 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).
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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]