Abstract
Abstract Well-shaped single crystals of the europium(II) aluminate Eu3Al2O6 were obtained as a side product during a synthesis attempt for EuCdAl. The structure was refined from single crystal X-ray diffractometer data of a twinned specimen: Ca3Al2O6 type, P a 3 ¯ , $Pa\bar 3,$ a =1584.82(2) pm, wR =0.0570, 2034 F 2 values, and 103 variables. All aluminium atoms in the Eu3Al2O6 structure show tetrahedral oxygen coordination, and the AlO4 tetrahedra (173–178 pm Al–O) are condensed via common corners to two-dimensional networks. The six crystallographically independent europium sites have coordination numbers 6, 7, 8, and 9, and their europium–oxygen polyhedra are linked with the AlO4 tetrahedra to a dense packing. Bond-valence calculations reveal two sets of differently bonded europium atoms.
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