Kink site position equilibrium conditions

Among the different surface atom positions illustrated on Fig. 2.8, the kink site position, or the half crystal position, as introduced independently by Kossel [2.12] and Stranski [2.13], has a special significance for the definition of the equilibrium conditions (vapor pressure, equilibrium concentration, equilibrium electrode potential, etc.) of the infinitely large (bulk) crystal. 

DENSITY OF KINK SITE POSITIONS 7.4.1 Equilibrium conditions... 

The density of kink site positions A and AA at equilibrium potential is [ksp]Q. For equilibrium conditions one gets, Thus it follows with Eq. (7.25) ... 

A special situation that can cause stationary conditions is at the electrochemical equilibrium potential (Nemst potential). The current density at the Nemst potential is the exchange current density The density of kink site positions [fopJo is therefore proportional to the product of exchange current density Iq and residence time, as was already shown in Eq. (7.34). 

The calculation of [fop], takes into account the nature of the metal (by r) and the electrochemical conditions (by if). The value of ig reflects the different experimental parameters like electrolyte composition, and additives, etc. Therefore, the values of the density of kink site positions provide an image of the surface dynamic at equilibrium conditions. While the absolute values might be questionable, the comparative nature of the described procedures allows at least a comparison of the dynamics of experimental systems. The values for Ag reflect the density of kink site positions for three experimental conditions. The largest value of 5 X lO cm corresponds to one of the highest experimental exchange current densities observed. In this case, [fopJo approaches the surface density of atoms on... 

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