Samarium(III) fluoride

Samarium(III) fluoride (SmF3) is a slightly hygroscopic solid fluoride. At room temperature, it has orthorhombic structure with space group Pnma – β-YF3 type with lattice constants a = 666,9 pm, b = 705,9 pm, c = 440,5 pm. Above 495 °C, it has the rhombohedral LaF3 structure (space group P3cl) – with lattice constants a = 707, c = 724 pm.[1]

Samarium(III) fluoride
Names
IUPAC name
samarium(III) fluoride
Other names
samarium trifluoride
trifluorosamarium
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.956
EC Number
  • 237-367-3
  • InChI=1S/3FH.Sm/h3*1H;/q;;;+3/p-3 checkY
    Key: OJIKOZJGHCVMDC-UHFFFAOYSA-K checkY
  • InChI=1/3FH.Sm/h3*1H;/q;;;+3/p-3
    Key: OJIKOZJGHCVMDC-DFZHHIFOAV
  • F[Sm](F)F
Properties
SmF3
Molar mass 207.36 g/mol
Appearance Yellow odorless powder
Density 6.6 g/cm3 at 20 °C
Melting point 1,306 °C (2,383 °F; 1,579 K)
Boiling point 2,427 °C (4,401 °F; 2,700 K)
Insoluble
Structure
Orthorhombic, oP16, SpaceGroup = Pnma, No. 62
Related compounds
Other anions
 Samarium(III) chloride
Samarium(III) bromide
Samarium(III) iodide
Other cations
 Samarium(II) fluoride
Hazards
GHS labelling:
GHS06: ToxicGHS07: Exclamation mark
Danger
H301, H311, H315, H319, H331
P261, P264, P270, P271, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501
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

Conditions/substances to avoid are: open flame, moisture, strong acids.

References
  1. K Rotereau et al.: The high-temperature phase transition in samarium fluoride, SmF3: structural and vibrational investigation, J. Phys.: Condens. Matter, 1998, 10, 1431–1446, doi:10.1088/0953-8984/10/6/026.


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