Abstract
In the ternary system Eu/P/O the anhydrous phosphates EuII3(PO4)2, EuII3EuIII(PO4)3, EuIII3O3(PO4), EuIIIPO4, EuIII(PO3)3, and EuIIIP5O14 exist at equilibrium conditions (ϑ ≈ 1000 °C). A superstructure model for EuII3EuIII(PO4)3 [Eulytite structure family, Fdd2, Z = 24, a = 14.298(1) Å, b = 42.123(3) Å, c = 10.3887(9) Å] is proposed. The results of single‐crystal X‐ray diffraction (SXRD) studies on EuII10–xEuIIIx(PO4)6O1+x/2 (x ≈ 1.5), EuIII3O3(PO4) and ht‐EuIII(PO3)3 are reported. The crystal structures of the thermodynamically metastable phases EuIII2P4O13 (isotypic to YIII2P4O13) and lt‐EuIII(PO3)3 (isotypic to GdIII(PO3)3) were refined from X‐ray powder diffraction data (XRPD). According to our investigation for the oxide phosphide “EuII4OP2” an europium deficiency has to be assumed according to EuII4–xEuIII2x/3OP2 (x ≈ 1.5).
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