Matlockite-type PbFl

Lead fluoride iodide adopts the matlockite (PbFCl) structure type and is is otypic with other fluoride halides MFX (M=Ca, Sr, Ba, Sm, Eu, Pb; X = Cl, B r, I). The Pb and I atoms are situated on positions with site symmetry 4mm and the F atom on a position with site symmetry (4) over bar m2. The Pb ato m is surrounded by four F atoms and four I atoms at the vertices of a squar e antiprism with distances of d(Pb-F) = 2.5631 (5)Angstrom and d(Pb-I) = 3. 3613 (7) Angstrom.