Crystal structure of graphite bromine lamellar compounds

✍ Scribed by T. Sasa; Y. Takahashi; T. Mukaibo

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 818 KB
• Volume: 9
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(71)90021-2

✦ Synopsis

The isotherm of bromine on pyrolytic graphite was studied at 20°C by stepwise bromination, and several phases of graphite bromide were identified, which have compositions of C,Br, C,*Br, C16Br and C,,,Br. X-ray studies show that these possess the socalled 2nd, 3rd, 4th and 5th stage structures respectively. At bromine concentrations between these definite compositions, X-ray diffraction patterns show mixtures of the higher stage and the lower stage structures. The density of the intercalated bromine molecules in a layer is believed to stay unchanged with the change of the composition. During the course of the reaction with the saturated vapor of bromine, an intermediate metastable lamellar compound structure was found in which the bromine layers are intercalated into everv second laver soacing but for which the bromine concentration is believed to be much lo&er than that of'C,BrP