ABSTRACT
Figure 6.2 Idealized lattice structure of NiO, a p-type semiconductor. (a) Pure NiO; (b) effect of cr+++ additions; and (c) effect of u+ additions.
(6.13)
(6.14)
Furthermore, due to a predominance of Frenkel-type disorder, pure AgBr is always in equilibrium with some cation vacancies and cation interstitials. For example:
AgBr ~ Agi + V~ + Br,, (6.15)
and also
[V~1][Agi] = Kf, (6.16) where Kf, is the equilibrium constant for ionized Frenkel defect formation at a constant temperature, and [V~] and [Agi) represent the concentration of ionized cation vacancies and cation interstitials per m3 of AgBr.
