B. L. Clink, H. Eick
Jun 1, 1979
Citations
0
Influential Citations
11
Citations
Journal
Journal of Solid State Chemistry
Abstract
A divalent europium chloride-bromide phase, EuBr/sub 1.56(7)/Cl/sub 0.46(2)/ has been prepared and identified on the basis of analytical, x-ray powder diffraction and single-crystal data. Although the phase is considered isostructural with EuCl/sub 2/(PbCl/sub 2/ structure type, ..cap alpha.. = 0.9230(5), b = 0.7890(4), c = 0.4613(3) nm, space group Pbnm), the single-crystal data indicate long-range order in the form of a superstructure which doubles the b parameter. In the pseudocell the square pyramidal anion sites are occupied principally by bromide ions, the tetrahedral sites almost equally by bromide and chlorine ions. Structural details and the long-range order are discussed. Evidence is presented for the existence of another europium(II) mixed halide phase, EuBr/sub 1.8(2)/Cl/sub 0.16(2). 5 tables.