Halogens, Halides, Oxides, and Acids

The X-ray crystal structure, electrical conductivity, and thermal stability of the lamellar compound Cgv.gCrOgClg have been determined. The compound, which is of the third stage (with a c-axis dimension of 14.87 A) was found to be unusually stable, and its conductivity as well as composition shows but slight change after complete evacuation of the reacting CrOgClg gas. 

Pure perchloric acid has been observed to react slowly with graphite at room temperature, to give the first-stage intercalation compound C24.9, CIO4,2HCIO4 and chlorine trioxide 

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