Question

​give the coordination no. of the following-
(a)atom at body centre (b)atom at corner of simple cubic cell (c)atom at corner of bcc unit cell (d) atom at face centre (e)atom at corner of fcc unit cell (f)atom in octahedral void (g)atom in tetrahedral void.

Answer 1

1. An atom at the body centre is surrounded by 8 atoms. Thus, the coordination number is 8.

2. An atom at corner in simple cubic is surrounded by 6 atoms. Coordination number is 6.

3. Atom at the corner of bcc has coordination number 8.

4. Atom in fcc has coordination number 12 in all the cases.

5. In tetrahedral void coordination number is 4 and in octahedral void it is 8.