QUT ePrints

Application of UV-Vis, near-infrared and mid-infrared spectroscopy to the study of Mn-bearing humites

Frost, Ray L., Palmer, Sara J., & Reddy, B. Jagannadha (2007) Application of UV-Vis, near-infrared and mid-infrared spectroscopy to the study of Mn-bearing humites. Polyhedron, 26(2), pp. 524-533.

View at publisher

Abstract

The combination of electronic and vibrational spectra has been applied to correlate the spectral properties, with composition, structure and cation substitutions such as Mn, Fe, Ca and Zn for Mg in humites: norbergite, alleghanyite, leucophoenicite and sonolite with increasing number of silicate layers, 1, 2, 3 and 4. The observation of two broad bands in the visible range, near 550 nm and 450 nm (18180 and 22220 cm-1) and one sharp band around 410 nm (24390 cm-1) is characteristic of Mn2+ in alleghanyite and leucophoenicite. The study of UV-Vis (electronic) spectral features confirms Mn as a major substituent in these two samples. Cation impurities like Zn and Ca as revealed from EDX analysis might be the cause for the absence of Mn-type spectrum in sonolite. The first observation is the near-infrared spectra of all four minerals in the first fundamental overtone OH-stretching mode are different and each mineral is characterized by its NIR spectrum. The feature in the range 7180-6600 cm-1 [1393 to 1515 nm or 1.39 to 1.52 µm] corresponds to the overtones of OH stretching vibrational modes of the humite groups observed in their IR spectra over the range, 3680-3320 cm-1. The infrared spectra of the hydrous components of OH and SiO4 groups in the mineral structure act as an aid to distinguish the minerals of the humite mineral group. A band at 541 cm-1 is assigned to MnO stretching mode.

Impact and interest:

11 citations in Scopus
Search Google Scholar™
12 citations in Web of Science®

Citation countsare sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

356 since deposited on 02 Feb 2007
70 in the past twelve months

Full-text downloadsdisplays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 6048
Item Type: Journal Article
Keywords: Norbergite, Alleghanyite, Leucophoenicite, Sonolite, UV, Vis, NIR and mid, IR spectroscopy, Electronic spectra of Mn2+, Overtone and combination bands, Layered silicates
DOI: 10.1016/j.poly.2006.09.038
ISSN: 0277-5387
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2007 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 02 Feb 2007
Last Modified: 06 May 2014 09:44

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page