Europium-doped barium bromide iodide

Abstract

Key indicators: single-crystal X-ray study; T = 153 K; mean (Ba-Br) = 0.0014 Å; disorder in main residue; R factor = 0.015; wR factor = 0.033; data-to-parameter ratio = 20.5.Single crystals of Ba 0.96 Eu 0.04 BrI (barium europium bromide iodide) were grown by the Bridgman technique. The title compound adopts the ordered PbCl 2 structure [Braekken (1932). Z. Kristallogr. 83, 222-282]. All atoms occupy the fourfold special positions (4c, site symmetry m) of the space group Pnma with a statistical distribution of Ba and Eu. They lie on the mirror planes, perpendicular to the b axis at y = AE0.25. Each cation is coordinated by nine anions in a tricapped trigonal prismatic arrangement.

BaBrI:Eu2+, a new bright scintillator

“…The crystal is orthorhombic with Eu fully substituted on the Ba sites. The structure is of the PbCl 2 -type [5]. The density, calculated from the structure is 5.18 g/cm 3 and was measured to be 5.3 ± 0.2 g/cm 3 .…”