Abstract
Single crystals of barium hexagallate have been grown in a Na 2OGa 2O 3 flux. The compound is hexagonal a = 5.859(2) A ̊ , c = 23.192(9) A ̊ . The crystal structure was determined by single crystal X-ray reflection data and refined to a final R-value of 0.018. The structure was revealed to be of β-alumina type, with a formula Ba 0.65Ga 10.80O 16.84, and not of magnetoplumbite type as it was conventionally considered. The Ba 2+ ion is located only in a 6h site, near the Beevers-Ross one. The charge compensation mechanism is that of gallium vacancies in the tetrahedra of the middle of the spinel block instead of that of Frenkel defects.
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