| Bismuth trifluoride | |
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Bismuth(III) fluoride |
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Other names
Bismuth trifluoride |
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| Identifiers | |
| CAS number | 7787-61-3 |
| ChemSpider | 21172751 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | BiF3 |
| Molar mass | 265g mol-1 |
| Appearance | grey-white powder |
| Density | 5.32 g cm-3[1] |
| Melting point |
649˚C[2] |
| Solubility in water | Insoluble in water[1] |
| Structure | |
| Crystal structure | Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (β phase) |
| Hazards | |
| R-phrases | R36/38 |
| S-phrases | S26 |
| Main hazards | Irritant |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Bismuth trifluoride is a chemical compound of bismuth and fluorine. The chemical formula is BiF3. It is a grey-white powder melting at 649°C.
Bismuth trifluoride can be prepared by reacting bismuth(III) oxide with hydrofluoric acid:[2]
α-BiF3 has a cubic crystalline structure (Pearson symbol cF16, space group Fm-3m, No. 225). β-BiF3 has the YF3 structure where the bismuth atom has distorted 9 coordination, tricapped trigonal prism.[3] This structure is generally considered to be ionic, and contrasts with fluorides of the lighter members of group 5, phosphorus trifluoride, PF3, arsenic trifluoride, AsF3 and antimony trifluoride, SbF3, where MX3 molecular units are present in the solid.[3]
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