What fraction of the holes of this type does it occupy? — Solid State Chemistry Question

💡 Solution & Explanation

A close-packed unit cell consisting of 4 lattice points (1 Ba + 3 O) contains 4 octahedral holes. Since there is only 1 titanium ion per unit cell at the body center, it occupies exactly 1/4 (0.25) of the octahedral holes.