Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10638662 | Materials Chemistry and Physics | 2005 | 6 Pages |
Abstract
The environment, location and interaction of the Ce3+ ions in the micropores of Al- and Zr-pillared clays have been studied by UV-vis-diffuse reflectance spectroscopy (UV-vis-DRS). The DRS spectra show that the chemical environment of the Ce3+ ions in cerium exchanged clay is different from that of the Al- and Zr-pillared clays. The Al-Ce pillared clays (Al-Ce-PM) show four distinct absorption bands at 224, 263, 294 and 342 nm in the UV region which are attributed to 4f â 5d interconfigurational transitions of Ce3+ ions associated with alumina pillars. The O2â â Ce3+ charge transfer band observed at 263 nm for Ce-exchanged and Al-Ce-PM clays is blue shifted by 10 nm for Ce-Zr-pillared clays (Ce-Zr-PM) due to fully hydrated Ce3+ ions. The Ce3+ ions are incorporated in the Al- and Zr-pillars possibly as AlCeO3 and CexZr1âxO2 particles upon heat treatment.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
G. Ranga Rao, Braja Gopal Mishra,