 Crystal structure | |
| Names | |
|---|---|
| Other names Actinium(III) fluoride Actinium trifluoride | |
| Identifiers | |
3D model (JSmol) | |
| |
| |
| Properties | |
| AcF3 | |
| Molar mass | 284 g/mol[1] |
| Appearance | white, crystalline solid |
| Density | 7.88 g/cm3[1] |
| Structure | |
| Rhombohedral,hR24 | |
| P3c1, No. 165[2] | |
a = 0.741 nm,c = 0.755 nm | |
Lattice volume (V) | 0.35902 |
Formula units (Z) | 6 |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Actinium(III) fluoride (AcF3) is aninorganic compound, a salt ofactinium andfluorine.
Actinium fluoride can be prepared in solution or by a solid-state reaction. In the first method,actinium hydroxide is treated withhydrofluoric acid and the product precipitates:[3]
In the solid-state reaction, actinium metal is treated withhydrogen fluoride gas at 700 °C in a platinum crucible.[4][5]
Actinium fluoride is a white solid that reacts with ammonia at 900–1000 °C to yield an actinium oxyfluoride:
While lanthanum oxyfluoride is easily formed by heatinglanthanum fluoride in air, a similar treatment merely melts actinium fluoride and does not yield AcOF.[4][5]
