Actinium(III) fluoride

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Actinium fluoride
Kristallstruktur Lanthanfluorid.png
Crystal structure
Other names
Actinium(III) fluoride
Actinium trifluoride
3D model (JSmol)
  • InChI=1S/Ac.3FH/h;3*1H/q+3;;;/p-3 checkY
  • InChI=1/Ac.3FH/h;3*1H/q+3;;;/p-3
  • F[Ac](F)F
Molar mass 284 g/mol[1]
Appearance white, crystalline solid
Density 7.88 g/cm3[1]
Rhombohedral, hR24
P3c1, No. 165[2]
a = 0.741 nm, c = 0.755 nm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]


  1. ^ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.44. ISBN 1-4398-5511-0.
  2. ^ Zachariasen, W. H. (1949). "Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types". Acta Crystallographica. 2 (6): 388–390. doi:10.1107/S0365110X49001016.
  3. ^ Haire, Richard G. (2006). "Actinium". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. p. 36. ISBN 1-4020-3555-1.
  4. ^ a b Fried, Sherman; Hagemann, French; Zachariasen, W. H. (1950). "The Preparation and Identification of Some Pure Actinium Compounds". Journal of the American Chemical Society. 72 (2): 771. doi:10.1021/ja01158a034.
  5. ^ a b Meyer, Gerd and Morss, Lester R. (1991) Synthesis of lanthanide and actinide compounds. Springer. ISBN 0-7923-1018-7. pp. 87–88