Europium(II) fluoride
IUPAC name
Europium(II) fluoride
Other names
Europium difluoride
3D model (JSmol)
ECHA InfoCard 100.203.721 Edit this at Wikidata
  • InChI=1S/Eu.2FH/h;2*1H/q+2;;/p-2
  • F[Eu]F
  • [F-].[F-].[Eu+2]
Molar mass 189.96
Appearance dark yellowish solid[1]
Density 6.495 g·cm−3
Fluorite structure
Fm3m (No. 225)
a = 584.23 pm
GHS labelling:
GHS06: Toxic
P264, P270, P301+P310, P321, P330, P405, P501
Related compounds
Other anions
Europium(II) bromide
Europium(II) chloride
Europium(II) iodide
Other cations
Samarium(II) fluoride
Thulium(II) fluoride
Ytterbium(II) fluoride
Related compounds
Europium(III) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Europium(II) fluoride is an inorganic compound with a chemical formula EuF2. It was first synthesized in 1937.[1]


Europium(II) fluoride can be produced by reducing europium(III) fluoride with metallic europium or hydrogen gas.[3]


Europium(II) fluoride is a bright yellowish solid with a fluorite structure.[3]

EuF2 can be used to dope a trivalent rare-earth fluoride, such as LaF3, to create a vacancy-filled structure with increased conductivity over a pure crystal. Such a crystal can be used as a fluoride-specific semipermeable membrane in a fluoride selective electrode to detect trace quantities of fluoride.[4][5]


  1. ^ a b Zhao Yongzhi, Ma Ying, Hou Shaochun, Zhang Wenjuan, Wang Jingjing, Ding Yanrong, Hao Yifan. 氟化亚铕研究现状 (lit. Research Progress of Europium(II) Fluoride). Chinese Rare Earths, 2017. 38 (5): 134-140. (in Chinese)
  2. ^ Greis, Ortwin; Haschke, John M. (1982). "Chapter 45 Rare earth fluorides". Handbook on the Physics and Chemistry of Rare Earths Volume 5. Elsevier. pp. 387–460. doi:10.1016/s0168-1273(82)05008-9. ISSN 0168-1273.
  3. ^ a b Georg Brauer: Handbuch der Präparativen Anorganischen Chemie. 3., umgearb. Auflage. Band I. Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 255.
  4. ^ Light, Truman S.; Cappuccino, Carleton C. (April 1975). "Determination of fluoride in toothpaste using an ion-selective electrode". Journal of Chemical Education. 52 (4): 247–250. Bibcode:1975JChEd..52..247L. doi:10.1021/ed052p247. PMID 1133123.
  5. ^ Frant, Martin S.; Ross, James W. (23 December 1966). "Electrode for Sensing Fluoride Ion Activity in Solution" (PDF). Science. 154 (3756): 1553–1555. Bibcode:1966Sci...154.1553F. doi:10.1126/science.154.3756.1553. JSTOR 1720460. PMID 5924922. S2CID 11042445.