Question

Calculate percentage of void in fcc structure

Answer 1

Answer:

the answer of this question is 23

Answer 2

Answer:

1. we can calculate void in FCC by calculating packing efficiency in FCC strutcture
2. as we know that in FCC co ordination number is 12 and radius
3. r = a/2 $root 2$
4. packing efficiency  = z × 4/3πr²/v
5. by putting the values we get finally  74% is packing efficiency
6. now for  void 100-74 =26
7. so 26% is a void space in fcc structure
8. FCC have 4 no of atoms per unit cell