Volume Density

Question 1

Volume Density of atoms in a Simple Cube Structure

Answer 1

1/8 sphere

(1/8 atom * 8)/(Volume of cube)

(1 atom)/(a^3) where a is the lattice constant

Question 2

Volume density units

Answer 2

1/cm^3

Question 3

Volume Density of Atoms in a Body Centered Cubic (BCC)

Answer 3

2/a^3

Question 4

Volume Density of Atoms in a Face Centered Cubic (FCC)

Answer 4

((1/8 * 8) + (1/2 * 6))/a^3

4/a^3

4 atoms per unit cell

Question 5

Volume Density of Atoms in a Diamond Crystal Structure

Answer 5

((1/8 * 8) + (1/2 * 6) + 4)/a^3

8/a^3

Si, Ge

Question 6

GaAs

Answer 6

In the unit cell, there will be 4 Ga atoms and 4 As atoms

Zincblende crystal lattice

Question 7

Volume density of Ga atoms in GaAs

Answer 7

4/a^3

Question 8

Volume density of As atoms in GaAs

Answer 8

4/a^3

Question 9

Density

Answer 9

N*m (g/cm^3)