Single crystals of tribarium gallate (Ba₃Ga₂O₆) have been synthesized from a melt with composition 70 mol.% BaO and 30 mol.% Ga₂O₃ in the temperature range between 1200°C and 1400°C. The compound adopts space group Pa-3 with a = 16.746(9) Å and Z = 24 formula units per unit cell. The refinement of the atomic parameters resulted in a residual of R1 = 0.040 (wR2 = 0.102) for 1157 observed reflections (I>2 σ (I)). Ba₃Ga₂O₆ belongs to the group of cyclo-gallates and is closely related to K₄SrGe₃O₉. Main building element are isolated, highly puckered, twelve-membered rings build by [GaO₄]-tetrahedra. Charge balance is achieved by incorporation of Ba ions in the voids between the rings. The coordination number of the alkaline earth atoms is six, eight and nine, respectively.

Keywords: crystal structure, tribariumgallate

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