•• •• zn•• : zn•• zn•• o= zn•• zn•• zn•• zn•• zn•• Zn·· zn•• zn•• zn•• cr••• zn•• cr••• zn•• zn•• zn•• o• zn•• zn•• u• zn•• o" o"' zn•• zn•• Figure 6.1 u+ additions. of dissolving cations of higher and lower valences than the

doi:10.1201/9781482292244-34

Chapter

ABSTRACT

So the net effect of dissolution of higher valent cation into cation-deficient ptype oxide (NiO) leads to the creation of more cation vacancies and reduction in the concentration of electron holes. As a consequence, there will be an increase in cationic conductivity and a decrease in electronic conductivity. The net result would be to increase the oxidation rate as a result of easier diffusion of Nil+ ions through the increased number of cation vacant sites. This means that Cr-doped Ni would oxidize at a faster rate than pure Ni at the same temperature and partial pressure of oxygen.