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Figure 9
Combination of octahedra with two different sizes. Hypothetical [Ca3Al4F21]3−: space group P[\bar{4}]3n, a = 9.160 Å, R = 0.0127, PCOD1010005. One can distinguish the tetrahedra of [AlF6] octahedra existing in the τ-AlF3 variety and in the pyrochlore structure type.

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