Question

The length of Burgers vector b in copper (Cu), which has an FCC crystal structure, is

• A. b = 0.25563 nm
• B. b = 1.25563 nm
• C. b = 2.25563 nm
• D. b = 1.325563 nm

Hint:

FCC crystals have closely packed structures. The Burgers vector is always proportional to the lattice parameter a.

Answer 1

The Correct Option is A

For FCC structures, the Burgers vector is given by:
\[b = a \sqrt{\frac{1}{2}}\]
where \(a\) is the lattice parameter. Substituting the given lattice parameter for Cu:
\[b = 0.361 \, \text{nm} \times \sqrt{\frac{1}{2}} \approx 0.25563 \, \text{nm}\]