The paper, published in Angewandte Chemie International Edition, reveals how t 2 occupancy—a key electronic characteristic of tetrahedral crystal ... and octahedral sites in the spinel structure ...

It then follows that 1/8 of the tetrahedral holes are occupied, and 1/2 of the octahedral holes. The first way to think of the spinel structure is the array of Al atoms. They sit on the corners of ...