Abstract
The phase diagram in the CsBr-AlBr3 system has been
reinvestigated. An adjusted liquidus diagram is given, showing the
compound CsAlBr4 which melts congruently at 360 oC. The lack of
consistency among previous results is presumably due to the
presence of oxide impurities formed by attack of bromide on the
silica ampul walls. Some molten salt density data are given. The
CsAlBr4 crystal structure has been solved in the orthorhombic
space group Pnma, no. 62 (D2h16), with a = 12.2137(20) , b =
7.5304(14) and c = 9.9293(16) Å, by means of X-ray powder
diffraction and full-profile Rietveld refinements, converging with
RP = 0.0952 and RWP = 0.1236 (Rexpected = 0.0509 , "goodness of
fit" = 2.42, Bragg R-factor = 0.0419, and derived R-F = 0.0458).
The AlBr4 tetrahedron is almost regular with Al-Br bond distances
in the range 2.20-2.35 Å, in accordance with what is to be
expected from previous related structure determinations.
| Original language | English |
|---|---|
| Journal | Acta Chem, Scand. |
| Volume | 51 |
| Pages (from-to) | 455-461 |
| Publication status | Published - 1997 |