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Barium in BaMgF 4  and in Ba 6 Mg 7 F 26  can be partially replaced by Sr or Eu. The single crystal structural analysis of the title compounds ( a  = 409.06 pm,  b  = 1452.7 pm,  c  = 579.02 pm, space group  Cmc 2 1  for Ba 0.78(3) Eu 0.22(3) MgF 4  [ Z  = 2,  R  w  = 0.023 for 998 reflections] and  a  = 583.47 pm,  b  = 1209.09 pm and  c  = 1506.56 pm, space group  Immm  for Ba 5.20(6) Eu 0.80(6)  · Mg 7 F 26 ) MgF 4  [ Z  = 2,  R  w  = 0.019 for 2694 reflections] confirms the substitution of 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 fluoride neighbors by simultaneously reducing the coordination sphere.

Crystal structures of Eu(II) substituted barium magnesium fluorides: Ba 0.78(3) Eu 0.22(3) MgF 4 and Ba 5.20(6) Eu 0.80(6) Mg 7 F 26