Uranium trifluoride

Hexagonal

A = 717.9 pm c = 734.5 pm

U, F

Urantrifluorid

Purple solid

Fixed

8.9 g · cm -3

1140 ° C.

Risk

- ( 1508.5 ± 5.5 ) kJ · mol -1

Template: Infobox chemical / molecular formula search is not possible

Uranium (III ) fluoride is a chemical compound consisting of the elements of uranium and fluorine. It has the formula UF3 and belongs to the class of fluorides.

Production and representation

Uranium (III ) fluoride can be obtained by reaction of uranium (IV ) fluoride with aluminum at 900 ° C.

Also possible is the preparation by reaction with a stoichiometric amount of uranium.

Properties

Uranium (III ) fluoride is a purple solid which melts at 1140 ° C. When heated to temperatures above 1200 ° C, it disproportionates to uranium (IV ) fluoride and uranium. Its crystal structure is hexagonal with space group P63/mcm with the lattice parameters a = 717.9 pm and c = 734.5 pm. This corresponds to that of lanthanum. Here, each Uranion of nine fluoride ion is surrounded in a distorted triple- capped trigonal prismatic structure.