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Single Crystal Structure of the Divalent Europium Chloroapatite Eu5(PO4)3Cl

Hamdi Ben Yahia, Ute Ch. Rodewald, Rainer Pöttgen
2009 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
The chloroapatite Eu5(PO4)3Cl has been synthesized by a solid-state reaction route using a salt flux. Its structure has been solved and refined from single crystal X-ray data: apatite type, P63/m, a = 988.36(4), c = 720.32(3) pm, Z = 2, R(F) = 0.021 and wR(F2) = 0.063 for 748 unique reflections and 40 variables. The Eu5(PO4)3Cl structure contains isolated (PO4)3− tetrahedra and two crystallographically independent divalent europium sites. The Eu12+ ion at the 4 f position is located in a
more » ... located in a distorted tri-capped trigonal prism whereas the Eu22+ ion at the 6h position is located in a strongly distorted square anti-prism. The chloride ions have octahedral europium coordination (307 pm Eu-Cl).
doi:10.1515/znb-2009-0515 fatcat:fgyxpvfexfgwbeovlcxwcw3hpi