Small-angle maxima and cation-cation distances. Differences between iron nitrate and perchlorate solutions

Abstract

X-ray diffraction data of aqueous solutions of iron(III) nitrate show a small-angle peak at an s value of about 0.5–0.9 A−1. A constant relationship between peak position and concentration leads to reject the hypothesis of a quasi-lattice structure for the solutions investigated. On the contrary, no peak is present in the same s range of diffraction data of iron (III) perchlorate solutions.