Abstract
Ba 2Ti 9O 20 crystallizes in the triclinic system with unit cell dimensions (from single crystal data) a = 14.358(4), b = 14.095(4), c = 7.477(1) Å, α = 95.53(3), β = 100.55(3), γ = 89.95(2)°, and space group P 1, z = 4 . The structure was solved using Patterson (“P1” method) and Fourier techniques. Of the 8625 unique reflections measured by counter techniques 3767 with I ≧ 3σ(I) were used in the least-squares refinement of the model to a conventional R of 0.057 ( Rω = 0.054). The structure of Ba 2Ti 9O 20 is very similar to that of hollandite except that additional barium ions replace oxygen ions and disrupt the tunnel walls resulting in the formation of cavities, rather than tunnels, that contain two barium ions per cavity.
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