Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 75: Issue 1
Thermal decomposition of humboldtine: A high resolution thermogravimetric and hot stage Raman spectroscopic study
Authors:
R. Frost Queensland University of Technology Inorganic Materials Research Program 2 George Street Brisbane GPO Box 2434 Queensland 4001 Australia 2 George Street Brisbane GPO Box 2434 Queensland 4001 Australia

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M. Weier Queensland University of Technology Inorganic Materials Research Program 2 George Street Brisbane GPO Box 2434 Queensland 4001 Australia 2 George Street Brisbane GPO Box 2434 Queensland 4001 Australia

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Pages:
277–291
Online Publication Date:
02 Nov 2004
Publication Date:
25 Jan 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1023/b:jtan.0000017349.31035.dd
Keywords:
hot stage Raman spectroscopy; infrared emission spectroscopy; oxalate; thermogravimetric analysis; high resolution; humboldtine
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Abstract  

Evidence for the existence of primitive life forms such as lichens and fungi can be based upon the formation of oxalates. These oxalates form as a film like deposit on rocks and other host matrices. Humboldtine as the natural iron(II) oxalate mineral is a classic example. Thermogravimetry coupled to evolved gas mass spectrometry shows dehydration takes place in two steps at 130 and 141°C. Loss of the oxalate as carbon dioxide occurs at 312 and 332°C. Dehydration is readily followed by Raman microscopy in combination with a thermal stage and is observed by the loss of intensity of the OH stretching vibration at 3318 cm-1. The application of infrared emission spectroscopy supports the results of the TG-MS. Three Raman bands are observed at 1470, 1465 and 1432 cm-1 attributed the CO symmetric stretching mode. The observation of the three bands supports the concept of multiple iron(II) oxalate phases. The significance of this work rests with the ability of Raman spectroscopy to identify iron(II) oxalate which often occurs as a film on a host rock.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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