Crystal structures of Eu(II) substituted barium magnesium fluorides: Ba0.78(3)Eu0.22(3)MgF4 and Ba5.20(6)Eu0.80(6)Mg7F26
| Autor: | Hans-Rudolf Hagemann, Hans Bill, Frank Kubel |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Barium fluorides
Experimental study Ion substitution Coordination sphere XRD Magnesium Crystal structure Inorganic chemistry Chemical composition Inorganic compounds chemistry.chemical_element Rare earth compounds Barium Europium fluorides Condensed Matter Physics Inorganic Chemistry Crystallography Magnesium fluorides chemistry ddc:540 General Materials Science Europium Single crystal |
| Zdroj: | Zeitschrift für Kristallographie, Vol. 214 (1999) pp. 139-142 Scopus-Elsevier |
| ISSN: | 2196-7105 2194-4946 0044-2968 |
| Popis: | Barium in BaMgF4 and in Ba6Mg7F26 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 Cmc21 for Ba0.78(3)Eu0.22(3)MgF4 [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 Ba5.20(6)Eu0.80(6) · Mg7F26) MgF4 [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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|