Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: Rs.

There are no items in this cart.
Continue Shopping
Rahul Sharma Grade: Upto college level
        when structure of iron changes from bcc to fcc, its atomic radius changes. why?
7 years ago

Answers : (1)

879 Points

Dear student,

First of all, although each FCC and BCC unit cell apparently consist of 14 and 9 atoms, it is the number of atoms WITHIN the unit cell which matters. For instance, the atoms in the corner of unit cells are shared by 8 unit cells, so only one eighth of each corner atoms must be counted. In the case of atoms located in the center of faces, only half of each atom is located within the unit cell of interest. Therefore,

Number of atoms within a FCC unit cell: (8*1/8)+(6*1/2)=4 atoms per unit cell
Number of atoms within a BCC unit cell: (8*1/8)+(1*1)=2 atoms per unit cell


Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..


Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

7 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!! Click Here for details