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The title compound is a new mixed-valence barium titanate (Ba II 4 Ti III 2 Ti IV 10 O 27 ). A refinement using X-ray powder data was carried out using the Rietveld method, with the lattice parameters and atomic sites of the isostructural compound Ba 4 Al 2 Ti 10 O 27 as a starting model.
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Antonio Currao (1999) studied this question.
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