Consider a crystal of Cu2O in which the majority of the point defects are copper vacancies. This crystal is placed in 1 atm of air. At constant temperature, the pressure is reduced to 3 torr.
Assuming chemical equilibrium, calculate the ratio of copper vacancies at reduced pressure to copper vacancies at atmospheric pressure. You need not consider oxygen vacancies or any interstitials.
Recall that in a compound material the ratio of lattice sites must remain fi xed.