Q.What is meant by the term "coordination number"? What is the coordination number of atoms in a bcc structure?

Step 1. The coordination number of a particle in a crystal is defined as the number of nearest-neighbour particles that surround it.

Step 2. In a body-centred cubic structure, each corner atom does not touch the other corner atoms, but every corner atom DOES touch the single body-centre atom, and conversely the body-centre atom touches all 8 corner atoms that surround it. …

Define coordination number as the nearest-neighbour count, then apply it specifically to the bcc geometry (each atom touches …

• Confusing the bcc coordination number (8) with the simple cubic (6) or hcp/ccp (12) values -- each cubic/close-packed a …