![]() Crystal structure | |
Names | |
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Other names Actinium(III) fluoride Actinium trifluoride | |
Identifiers | |
3D model (JSmol) | |
PubChem CID | |
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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 their standard state (at 25 °C [77 °F], 100 kPa). |
Actinium(III) fluoride (AcF3) is an inorganic compound, a salt of actinium and fluorine.
Actinium fluoride can be prepared in solution or by a solid-state reaction. In the first method, actinium hydroxide is treated with hydrofluoric acid and the product precipitates: [3]
In the solid-state reaction, actinium metal is treated with hydrogen 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 heating lanthanum fluoride in air, a similar treatment merely melts actinium fluoride and does not yield AcOF. [4] [5]