give a relationship between nearest neighbour distance(d),radius of at

1.	give a relationship between nearest neighbour distance(d),radius of atom(r), edge of unit cell(a), for fcc and BCC crystal
Answer» Simple cubic - Nearest dist - a, radius a/2 , z(no of atoms per unit cel) = 1 Fcc - Nd = a/(2)^1/2 , radius = a/2 root2 z=4 Bcc- Nd- a root 3 /2 ; radius = a root3 /4 z= 2 For the derivation and detailed answer must refer to master NCERT book.

give a relationship between nearest neighbour distance(d),radius of atom(r), edge of unit cell(a), for fcc and BCC crystal

Answer»

Simple cubic -

Nearest dist - a, radius a/2 , z(no of atoms per unit cel) = 1

Fcc -

Nd = a/(2)^1/2 , radius = a/2 root2 z=4

Bcc-

Nd- a root 3 /2 ; radius = a root3 /4 z= 2

For the derivation and detailed answer must refer to master NCERT book.

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give a relationship between nearest neighbour distance(d),radius of atom(r), edge of unit cell(a), for fcc and BCC crystal

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