Barium titanate has a pyrolusite structure (a cubic lattice), with barium ions occupying the cor...

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Barium titanate has a pyrolusite structure (a cubic lattice), with barium ions occupying the corners of the unit cell, oxide ions the face centres and titanium ions the centres. Asuming that \( \mathrm{Ti}^{44} \) ions occupy the holes of the \( \mathrm{BaO} \) lattice, what type of hole and what fraction of such holes do these ions occupy?
(A) \( 25 \% \) of the octahedral holes
(B) \( 50 \% \) of the tetrahedral holes
(C) \( 75 \% \) of the tetrahedral holes
(D) \( 100 \% \) of the octahedral holes
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