Investigation on the surface structure of precipitated silver iodide samples by krypton adsorption

Abstract

Detailed experimental isotherms are presented for the adsorption of krypton on precipitated silver iodide samples at temperatures between 77.5 and 79.1 K. Analyses of the variation in surface heterogeneity between samples are presented using a new algorithm, HILDA. The results indicate that despite the presence of a number of homotattic areas attributable to different crystal faces, much of the surface represents a wide distribution of adsorption potentials, and hence heterogeneity.

The results of isosteric heat determinations on one sample suggest that the V_m values derived from the HILDA analysis are too large, and that despite its theoretical limitations the B.E.T. method yields values of V_m that are more nearly in agreement with isosteric heat curve predictions.