Issue 8, 2015

Local structure of low-temperature γ-Al2O3 phases as determined by the luminescence of Cr3+ and Fe3+

Abstract

The γ and γ* phases of alumina synthesized from crystalline boehmite and pseudoboehmite were shown to strongly differ in some physicochemical characteristics. Photoluminescence of Cr3+ and Fe3+ as luminescent probes with their natural impurity concentrations was detected in the tested alumina samples and the local structure of the samples was examined. The crystal field strength and Racah parameters in γ-Al2O3 phases were determined. The ratio of octahedral and tetrahedral cationic positions was equal to 1 for γ-Al2O3 synthesized from crystalline boehmite, and 0.3 for that obtained from pseudoboehmite. The effect of residual OH groups and weakly bound molecular water on the local structure of γ-Al2O3 phases was revealed. The luminescence of Cr3+ was detected in subsurface structures of each alumina; defects produced by nanocrystallites were shown to affect the luminescence.

Graphical abstract: Local structure of low-temperature γ-Al2O3 phases as determined by the luminescence of Cr3+ and Fe3+

Article information

Article type
Paper
Submitted
14 Nov 2014
Accepted
11 Dec 2014
First published
11 Dec 2014

RSC Adv., 2015,5, 5686-5694

Author version available

Local structure of low-temperature γ-Al2O3 phases as determined by the luminescence of Cr3+ and Fe3+

A. Rastorguev, M. Baronskiy, A. Zhuzhgov, A. Kostyukov, O. Krivoruchko and V. Snytnikov, RSC Adv., 2015, 5, 5686 DOI: 10.1039/C4RA14524K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements