Crystal structures of Eu(II) substituted barium magnesium fluorides: Ba-0.78(3)Eu-0.22(3)MgF4 and Ba-5.20(6)Eu-0.80(6)Mg7F26

Authors
Kubel, F Hagemann, H Bill, H
Citation
F. Kubel et al., Crystal structures of Eu(II) substituted barium magnesium fluorides: Ba-0.78(3)Eu-0.22(3)MgF4 and Ba-5.20(6)Eu-0.80(6)Mg7F26, Z KRISTALL, 214(3), 1999, pp. 139-142
Citations number
14
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ZEITSCHRIFT FUR KRISTALLOGRAPHIE
ISSN journal
00442968 → ACNP
Volume
214
Issue
3
Year of publication
1999
Pages
139 - 142
Database
ISI
SICI code
0044-2968(1999)214:3<139:CSOESB>2.0.ZU;2-N
Abstract
Barium in BaMgF4 and in Ba6Mg7F26 can be partially replaced by Sr or Eu. Th e single crystal structural analysis of the title compounds (a = 409.06 pm, b = 1452.7 pm, c = 579.02 pm, space group Cmc2(1) for Ba-0.78(3)Eu-0.22(3) MgF4 [Z = 2, R-w = 0.023 for 998 reflections] and a = 583.47 pm, b = 1209.0 9 pm and c = 1506.56 pm, space group Immm for Ba-5.20(6)Eu-0.80(6). Mg7F26) MgF4 [Z = 2, R-w = 0.019 for 2694 reflections] confirms the substitution o f barium by europium. A split refinement of the substituted barium site in both crystals reveals a trend of europium to get closer to the nearest fluo ride neighbors by simultaneously reducing the coordination sphere.