FCC Unit Cell Concepts

The video tutorial explains the face-centered cubic (FCC) unit cell, highlighting its structure, coordination number, lattice parameter, and packing fraction. It compares FCC with simple cubic and body-centered cubic cells, emphasizing the higher density of FCC. The tutorial also covers the calculation of atoms per unit cell, the concept of primitive cells, and fundamental translational vectors. Examples of materials with FCC structures, such as aluminum and copper, are provided.

What is the main focus of the video regarding the FCC unit cell?

• Comparison with simple cubic and body-centered cubic unit cells

• Comparison with diamond cubic structures

• Comparison with hexagonal structures

• Comparison with amorphous structures

How many atoms are located at the corners of the FCC unit cell?

• Eight

• Four

• Six

• Twelve

What is the coordination number of an FCC unit cell?

• Twelve

• Ten

• Eight

• Six

What is the lattice parameter 'a' in terms of the atomic radius 'R' for an FCC unit cell?

• a = 3R

• a = 5R/√2

• a = 4R/√2

• a = 2R

How many atoms are effectively present inside an FCC unit cell?

• One

• Two

• Three

• Four

What is the packing fraction of an FCC unit cell?

• 74%

• 80%

• 68%

• 52%

Which unit cell has the highest packing fraction among simple cubic, BCC, and FCC?

• Simple cubic

• BCC

• FCC

• All have the same

What defines a primitive cell?

• Having 8 atoms inside

• Having 2 atoms inside

• Having 4 atoms inside

• Having 1 atom inside

Which of the following is an example of an FCC structure?

• Tin

• Zinc

• Copper

• Iron

What is the volume of the primitive cell of an FCC unit cell in terms of the unit cell volume?

• Half of the unit cell volume

• One-fourth of the unit cell volume

• Equal to the unit cell volume

• Twice the unit cell volume