In Example 9.22, we studied the growth of ZnO by oxidation of Zn. The conductivity of these fi lms is proportional to the concentration of free electrons. Develop a relationship between the conductivity of ZnO and the oxygen partial pressure with which it is processed. How does the conductivity change if the oxygen partial pressure is increased by a factor of 10?

Example 9.22

EXAMPLE 9.19

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Reformulate the solution of Example 9.19 using the minimization of Gibbs energy. Compare the results at 800 K. The Gibbs energies of formation at 800 K are given by: Species (A800); in [kJ/mol] CHA -2.105 HO - 203.477 CO -182.257 CO -395.418