3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||265.97550 g/mol|
|Density||5.32 g cm-3|
|Insoluble in water|
|Orthorhombic, oP16, SpaceGroup = Pnma, No. 62 (? phase)|
|GHS Signal word||Danger|
|P260, P264, P280, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P363, P405, P501|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
It occurs in nature as the rare mineral gananite.
?-BiF3 has a cubic crystalline structure (Pearson symbol cF16, space group Fm-3m, No. 225). BiF3 is the prototype for the D03 structure, which is adopted by several intermetallics, including Mg3Pr, Cu3Sb, Fe3Si, and AlFe3, as well as by the hydride LaH3.0. The unit cell is face centered cubic with Bi at the face centers and vertices, and F at the octahedral site (mid-edges, center), and tetrahedral sites (centers of the 8 sub cubes) - thus the primitive cell contains 4 Bi and 12 F. Alternatively, with the unit cell shifted (1/4,1/4,1/4) the description can be of a fcc cell with face, edge, corner, and centers filled with F, and half (4 of) the octant centers with F, the other half with Bi (each octant type tetrahedrally arranged). The edge length of the BiF3 cell is 0.5853 nm.
?-BiF3 has the YF3 structure where the bismuth atom has distorted 9 coordination, tricapped trigonal prism. This structure is generally considered to be ionic, and contrasts with fluorides of the lighter members of group 15, phosphorus trifluoride, PF3, arsenic trifluoride, AsF3 and antimony trifluoride, SbF3, where MX3 molecular units are present in the solid.
BiF3 is unaffected by water and is almost insoluble. It does not form complexes readily but the following, BiF3.3HF and BiF4- in NH4BiF4, are known. The addition compound H3BiF6 is hydrolysed by water forming BiOF.