Lanthanum trifluoride

Lanthanum trifluoride

Crystal structure
Names
Other names
Lanthanum(III) fluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.851
Properties
LaF3
Molar mass 195.900 g/mol[1]
Appearance white, crystalline solid
Density 5.9 g/cm3[1]
Melting point 1,493 °C (2,719 °F; 1,766 K)[1]
Structure
Rhombohedral, hR24
P3c1, No. 165[2]
a = 0.7185 nm, c = 0.7351 nm
0.32865
6
Hazards
Safety data sheet [3]
NFPA 704
[3]pg 3
Flammability code 0: Will not burn. E.g., waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Lanthanum trifluoride is a refractory ionic compound of lanthanum and fluorine.[4]

The LaF3 structure

Lanthanum coordination

Bonding is ionic with lanthanum highly coordinated. The cation sits at the center of a trigonal prism. Nine fluorides are close: three at the bottom corners of the trigonal prism, three in the faces of the trigonal prism, and three at top corners of the trigonal prism. There are also two fluorides a little further away above and below the prism. The cation can be considered 9-coordinate or 11-coordinate.[4]

The larger sized rare earth elements (lanthanides), which are those with smaller atomic number, also form trifluorides with the LaF3 structure.[4] Some actinides do as well.

Applications

The material is a component of multimetal fluoride glasses such as ZBLAN.[5] It is also used (with europium trifluoride) in fluoride selective electrodes.

References

  1. 1 2 3 Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.69. ISBN 1439855110.
  2. ↑ Zalkin, A.; Templeton, D. H. (1985). "Refinement of the trigonal crystal structure of lanthanum trifluoride with neutron diffraction data". Acta Crystallographica Section B. 41 (2): 91. doi:10.1107/S0108768185001689.
  3. 1 2 "Safety Data Sheet: Lanthanum(III) fluoride". Thermo Fisher Scientific. 19 January 2018. Retrieved 17 August 2018.
  4. 1 2 3 Cotton, Simon (30 January 2007). Lanthanide and Actinide Chemistry. Wiley. pp. 25–27. ISBN 978-0-470-01007-5.
  5. ↑ Harrington, James A. "Infrared Fiber Optics" (PDF). Rutgers University. Archived from the original (PDF) on 2010-08-02.


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