Also known as calcium fluoride structure. A kind of ion crystal structure represented by CaF2. Belongs to the cubic crystal system, with a face centered cubic lattice. Each unit cell of crystal contains four cations A and eight anions B. Anions (such as F -) have a simple cubic arrangement, while cations (such as Ca2+) fill half of the available anionic hexahedral center positions. There is a large vacancy in the center of unit cell of crystal, and the coordination number of positive and negative ions is 8 and 4 respectively. For this structure, Ca2+can also be considered as a "cubic dense pile", while F - occupies all tetrahedral voids.
Inorganic non-metallic materials -> Basics of inorganic non-metallic materials