Chemistry:Europium(II) fluoride
From HandWiki
| Names | |
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| IUPAC name
Europium(II) fluoride
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| Other names
Europium difluoride
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| EuF2 | |
| Molar mass | 189.96 |
| Appearance | dark yellowish solid[1] |
| Density | 6.495 g·cm−3 |
| Structure[2] | |
| Fluorite structure | |
| Fm3m (No. 225) | |
a = 584.23 pm
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Formula units (Z)
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4 |
| Hazards | |
| GHS pictograms | 
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| GHS Signal word | Danger |
| H301 | |
| P264, P270, P301+310, P321, P330, P405, P501 | |
| Related compounds | |
Other anions
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Europium(II) bromide Europium(II) chloride Europium(II) iodide |
Other cations
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Samarium(II) fluoride Thulium(II) fluoride Ytterbium(II) fluoride |
Related compounds
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Europium(III) fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Europium(II) fluoride is an inorganic compound with a chemical formula EuF2. It was first synthesized in 1937.[1]
Production
Europium(II) fluoride can be produced by reducing europium(III) fluoride with metallic europium or hydrogen gas.[3]
- [math]\displaystyle{ \mathrm{2 \ EuF_3 + Eu \longrightarrow 3 \ EuF_2} }[/math]
- [math]\displaystyle{ \mathrm{2 \ EuF_3 + H_2 \longrightarrow 2 \ EuF_2 + 2 \ HF} }[/math]
Properties
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]
References
- ↑ 1.0 1.1 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)
- ↑ 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.
- ↑ 3.0 3.1 Georg Brauer: Handbuch der Präparativen Anorganischen Chemie. 3., umgearb. Auflage. Band I. Enke, Stuttgart 1975, ISBN:3-432-02328-6, S. 255.
- ↑ 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. doi:10.1021/ed052p247. PMID 1133123. Bibcode: 1975JChEd..52..247L.
- ↑ Frant, Martin S.; Ross, James W. (23 December 1966). "Electrode for Sensing Fluoride Ion Activity in Solution". Science 154 (3756): 1553–1555. doi:10.1126/science.154.3756.1553. PMID 5924922. Bibcode: 1966Sci...154.1553F. https://www.jstor.org/stable/pdf/1720460.pdf.
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