Absorption and Raman spectra of Se8-ring clusters in zeolite 5A

✍ Scribed by Z. Lin; Z. Wang; W. Chen; L. Lir; G. Li; Z. Liu; H. Han; Z. Wang

• Book ID: 104167024
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 299 KB
• Volume: 100
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(96)00526-1

✦ Synopsis

Samples with different weight ratio of Se to zeolite 5A (Se composition) have been prepared by loading Se into the cages of zeolite 5A and the measurements of the absorption and Raman spectra have been carried out for the prepared samples. The measured absorption edges of the samples are close and blue shifted to the value for monoclinic Se containing Sea-ring, suggesting the formation of Sea-ring clusters? in the cages. The continuous and broadening features of the absorption spectra are interpreted by the strong electron-phonon coupling in Ses-ring clusters. The sample with high Se composition has a red shift of the absorption band edge relative to the samples with less Se composition. It is tentatively attributed to the reason that with different Se composition, single Ses-ring clusters and double &s-ring clusters are formed in the cages of zeolite 5A. A single broad band at about 262 cm-' is observed in the Raman spectra, that gives the further support of the formation of &s-ring clusters.