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Berkelium(III) fluoride

Names
Other names berkelium trifluoride
Identifiers
CAS Number	20716-88-5
3D model (JSmol)	Interactive image
ChemSpider	Bk: 64886344
InChI InChI=1S/Bk.3FH/h;3*1H/q+3;;;/p-3Key: DAFXIOTWBMWEKP-UHFFFAOYSA-K
SMILES ...
Properties
Chemical formula	BkF3
Molar mass	304 g·mol
Appearance	yellow-green solid
Density	9.70 g/cm
Related compounds
Related compounds	Berkelium tetrafluoride Einsteinium(III) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Berkelium(III) fluoride is a binary inorganic compound of berkelium and fluorine with the chemical formula BkF
₃.

Synthesis

The compound can be prepared by treating Bk
₂O
₃ with a gaseous mixture of H
₂ and HF at 600 °C.

Physical properties

Berkelium trifluoride forms a yellow-green solid with two structures. At low temperature, it is orthorhombic (YF
₃ structure), with lattice parameters a = 670 pm, b = 709 pm, and c = 441 pm. At high temperature, it is trigonal (LaF
₃ structure), with lattice parameters a = 697 pm and c = 714 pm. The transition temperature of BkF
₃ is between 350 and 600 °C.

Chemical properties

Berkelium trifluoride is reduced by lithium to obtain metallic berkelium:

BkF₃ + 3Li → Bk + 3LiF

References

1. Peterson, J. R.; Cunningham, B. B. (1 August 1968). "Crystal structures and lattice parameters of the compounds of berkelium—IV berkelium trifluoride". Journal of Inorganic and Nuclear Chemistry. 30 (7): 1775–1784. doi:10.1016/0022-1902(68)80353-7. ISSN 0022-1902. Retrieved 11 April 2023.
2. Edelstein, Norman M. (11 September 2013). Actinides in Perspective: Proceedings of the Actinides—1981 Conference, Pacific Grove, California, USA, 10-15 September 1981. Elsevier. p. 334. ISBN 978-1-4831-9051-8. Retrieved 11 April 2023.
3. "WebElements Periodic Table » Berkelium » berkelium trifluoride". webelements.com. Retrieved 11 April 2023.
4. Mi͡asoedov, Boris Fedorovich (1974). Analytical Chemistry of Transplutonium Elements. Wiley. p. 97. ISBN 978-0-470-62715-0. Retrieved 11 April 2023.
5. Ahrland, S.; Bagnall, K. W.; Brown, D. (7 June 2016). The Chemistry of the Actinides: Comprehensive Inorganic Chemistry. Elsevier. p. 161. ISBN 978-1-4831-5934-8. Retrieved 11 April 2023.
6. Peterson, J. R.; Fahey, J. A.; Baybarz, R. D. (1 October 1971). "The crystal structures and lattice parameters of berkelium metal". Journal of Inorganic and Nuclear Chemistry. 33 (10): 3345–3351. doi:10.1016/0022-1902(71)80656-5. ISSN 0022-1902. Retrieved 11 April 2023.
7. Ensor, D. D.; Peterson, J. R.; Haire, R. G.; Young, J. P. (1 January 1981). "Absorption spectrophotometric study of berkelium(III) and (IV) fluorides in the solid state". Journal of Inorganic and Nuclear Chemistry. 43 (5): 1001–1003. doi:10.1016/0022-1902(81)80164-9. ISSN 0022-1902. Retrieved 11 April 2023.

• Fluorides
• Berkelium compounds
• Actinide halides