Question

write a note on the assignment of atoms per unit cell in fcc​

Answer 1

Explanation:

The total number of atoms per unit cell in bcc.

=Nc8+Nb1=88+11=1+1=2=Nc8+Nb1=88+11=1+1=2

Nb=Nb= Number of atoms inside the body , NcNc is the number of atoms at the corners.

Answer 2

Explanation:

In a FCC lattice there rer 8 atoms at eight corners and 6 at face centers,

Now each corner contributes to eight cells so per unit cell contribution is 81×8=1atom.

Now similarly each face center contributes to two unit cells so contribution per unit cell by six face centers is equal to 21×6=3 atoms. Hence total no. of atoms per unit cell of FCC lattice is (1+3)=4 atoms.

For BCC-

A bcc has one atom in center and 81th part of 8 corner atoms i.e 1 atom.

In total there are 1+1=2 atoms.

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