Nomenclature
CAS number: 7789-24-4
FLi; mol wt 25.94.
F 73.24%, Li 26.76%.
LiF.
Description and references
Prepd from LiOH and HF or by dissolving Li2CO3 in excess HF, evaporating to dryness, and heating
to red heat: v. Wartenberg, Schultz, Z. Elektrochem. 27, 568 (1921); Kwasnik in Handbook
of Preparative Inorganic Chemistry vol. 1, G.
Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 235. Review
of toxicology of fluoride compounds: G. L. Waldbott, Acta Med. Scand. Suppl. 400, 1-44
(1963).
Properties
Cubic crystals (NaCl lattice) or white fluffy
powder. d20 2.640. mp 848°; bp 1681°. Volatilizes
at 1100-1200°. Soly in water (25°): 0.13 g/100 ml. Soluble in acids.
With hydrofluoric acid it forms lithium bifluoride, LiHF2. With lithium hydroxide it forms a double salt LiF.LiOH, mp 462°. LD in guinea pigs (mg/kg): 200 orally, 2000 s.c. (Waldbott).Use
As flux for soldering and welding aluminum, in the
manuf of vitreous enamels and glazes. Lithium fluoride prisms are
used in infrared spectrophotometers.