written 8.7 years ago by | • modified 8.7 years ago |
Mumbai university > FE > SEM 1 > Applied Physics 1
Marks: 5M
Year: May 2015
written 8.7 years ago by | • modified 8.7 years ago |
Mumbai university > FE > SEM 1 > Applied Physics 1
Marks: 5M
Year: May 2015
written 8.7 years ago by |
Diamond is a metastable allotrope of carbonwhere the each carbon atom is bonded covalently with other surrounding four carbon atoms and are arranged in a variation of the face centered cubic crystal structure called a diamond lattice.
1) No. of atoms per unit cell-
Corner -1/8 × 8 = 1
Face -1/2 × 6 = 3
Four atoms - 4
Total = 8 atoms
2) Atomic radius-
(XY)2=(XT)2+(YT)2
=(XT)2+(YZ)2+(TZ)2
(2r)2=(a4)2+(a4)2+(a4)2
r=√3a8
3) Co-ordination no. is 4
Each carbon atom is in touch with 1 corner & 3 face centered atoms in a tetrahedral fashion, hence co-ordination no. is 4
4) Atomic packing factor −vV=0.34=34%