Title: Bismuth Fluoride
CAS Registry Number: 7787-61-3
Additional Names: Bismuth trifluoride
Molecular Formula: BiF3
Molecular Weight: 265.98
Percent Composition: Bi 78.57%, F 21.43%
Literature References: Prepd by dissolving bismuth oxide or hydroxide in aqueous HF. May also be prepd by reduction of BiF5 with CO2 in very dil H2 at 80-150° in a Pt tube: Muir et al., J. Chem. Soc. 39, 33 (1881); v. Wartenberg, Z. Anorg. Allg. Chem. 244, 344 (1940); Aurivillius, Acta Chem. Scand. 9, 1206 (1955). Review: Kemmitt, Sharp, Adv. Fluorine Chem. 4, 213 (1965).
Properties: White to gray dimorphic crystals. d 8.3. mp 725-730°. Volatilizes at higher temps slowly and without decompn. Practically insol in water. Sol in concd HF with the formation of complexes.
Melting point: mp 725-730°
Density: d 8.3
Use: In the prepn of bismuth pentafluoride, q.v.