How many tetrahedral holes are occupied in diamond

The ZnS structure and the diamond structure are comparable (zinc sulphide). In the face-centered cubic structure of zinc sulphide, zinc or sulphur dioxide occupy the fcc lattice points in a different way. This indicates that sulphur occupies the remaining half of the tetrahedral voids and zinc occupies the other half.

Carbon, like ZnS in diamond, takes up half of the tetrahedral voids or holes. In fcc, there are a total of eight tetrahedral voids. Carbon occupies half of the 8 voids, or four.

As a result, carbon occupies 50% of the tetrahedral void in diamond.