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Yttrium(III) fluoride

| NFPA-H = | NFPA-R = | NFPA-F = Yttrium(III) bromide Yttrium(III) iodide Lutetium(III) fluoride

Yttrium(III) fluoride is an inorganic chemical compound with the chemical formula YF3. It is not known naturally in "pure" form. The fluoride minerals containing essential yttrium include tveitite-(Y) (Y,Na)6Ca6Ca6F42 and gagarinite-(Y) NaCaY(F,Cl)6. Sometimes mineral fluorite contains admixtures of yttrium.

Synthesis

YF3 can be produced by reacting fluorine with yttria or yttrium hydroxide with hydrofluoric acid.

:Y(OH)3 + 3HF → YF3 + 3H2O

Properties

Yttrium(III) fluoride has a refractive index of 1.51 at 500 nm and is transparent in the range from 193 nm to 14,000 nm (i.e. from the UV to IR range).

Pure yttrium can be obtained from yttrium(III) fluoride by reduction with calcium.

Yttrium(III) fluoride crystallizes in the orthorhombic crystal system, with space group Pnma (space group no. 62), with the lattice parameters a = 6.3537 Å, b = 6.8545 Å, c = 4.3953 Å. Yttrium is nine times coordinated by fluorine atoms.

Occurrence and uses

It occurs as the mineral waimirite-(Y).

Yttrium(III) fluoride can be used for the production of metallic yttrium, thin films, glasses and ceramics.

Hazards

Conditions/substances to avoid are: acids, active metals and moisture.

References

References

  1. Dinér, Peter. (February 2016). "Yttrium from Ytterby". Nature Chemistry.
  2. (2021-01-21). "Tiny particles produce huge photon avalanches".
  3. (1963). "Preparative Methods". Elsevier.
  4. (2007-09-28). "General Reserch Institute Nonferrous Metals".
  5. (1974). "The Structures of Yttrium and Bismuth Trifluorides by Neutron Diffraction.". Acta Chemica Scandinavica.
  6. "Waimirite-(Y): Mineral information, data and localities.".
  7. "Yttrium Fluoride, YF3 - For Optical Coating".
  8. "Yttrium Fluoride 99%-99.999% from Metall Rare Earth Limited".
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fluorides metal-halides yttrium-compounds
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