RADIOCHEMICAL STUDIES OF GRAPHITE FERRIC CHLORIDE

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Abstract
Graphite ferric chloride, C12FeCl3, was prepared by heating anhydrous ferric chloride with graphite at 305 °C. The purified compound containing 53% ferric chloride was not attacked by hot 6 N hydrochloric acid and gave an X-ray diffraction pattern which was distinctly different from that of either graphite or ferric chloride. The separation of the graphite layer-planes was increased from 3.36 to 9.4 Å by the intercalation of the ferric chloride molecules.Tests for exchange between C12FeCl3 and Fe+++ ion were made using radioactive Fe59. In no instance was any measurable exchange observed. The compound was subjected to neutron irradiation and the Szilard–Chalmers yield of separable activity calculated and identified. The separated portion contained less than 1% of the total activity and consisted of Fe59, P32, and S35.The lack of exchange and the low Szilard–Chalmers yield are attributed to the formidable steric hindrance effects which result from the "stacked layer" structure for graphite ferric chloride.

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