3. Crystal Structure and Defects
Point Defects — Quiz
Test your understanding of point defects with 5 practice questions.
Practice Questions
Question 1
Which point defect is characterized by a missing atom from the crystal lattice?
Question 2
Which point defect involves an extra atom positioned at a normally unoccupied site within the crystal lattice?
Question 3
What type of point defect is created when a foreign atom replaces a host atom in the lattice?
Question 4
At 1000 K, the vacancy formation energy in a metal is 1.0 eV. Using $k_{B}=8.617\times10^{-5}\,\mathrm{eV/K}$, what is the equilibrium fraction of vacant lattice sites $n_{v}/N$?
Question 5
A crystal contains $10^{22}$ lattice sites and has an equilibrium vacancy fraction of $9.0\times10^{-6}$. Approximately how many vacancies $n_{v}$ are present?