Crystal Structure

What is Packing Fraction of SC Lattice.

• .68

• .52

• .74

• None of these

What is c/a ratio of HCP?

• 1.633

• 1.233

• 1.833

• None of the above

How many number of atoms are there in FCC

• 1

• 4

• 2

• None of the above

Number of atoms per unit cell is highest in

• FCC

• BCC

• SC

• none of the above

Primitive unit cell is the ____________ volume cell of a crystal .

long-range order exists

• Crystalline material

• Amorphous Material

In order to compute the number of atoms per unit cell for the HCP crystal structure we will use

• 
  

  $N=Ni\ +\frac{Nf}{2}+\frac{Nc}{6}$

• $N=Ni\ +\frac{Nf}{2}+\frac{Nc}{8}$

the sum of the sphere volumes of all atoms within a unit cell (assuming the atomic hard-sphere model) divided by the unit cell volume

• Atomic packing factor (APF)

• Total unit cell volume

• Volume of atoms in a unit cell