Book Review. Review of Modelling of Structure and Reactivity in Zeolite, by C. R. A. Catlow.

✍ Scribed by Bradley P. Feuston

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 140 KB
• Volume: 102
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1035

✦ Synopsis

X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the ( (\mathrm{Bi}-\mathrm{O}) ) layers of the oxide superconductor (\mathrm{Bi}{2} \mathrm{Sr}{2} \mathrm{CaCu}{2} \mathrm{O}{x}) is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent (\mathrm{I}-\mathrm{O}) bonds as in (\mathrm{KIO}{4}), not as in (\mathrm{KIO}{3}). Electrons are transferred from the antibonding states of the covalent complex to the (\mathrm{CuO}{2}) sheets, which lowers (T{c}). The core-level spectra also show the presence of residual iodine species at the surface of the samples. Ar-ion sputtering of the surface disintercalates iodine from the bulk to the surface. 1993 Academic Press. Inc.