Thermal treatment of moolooite |
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Authors: | Frost R L Erickson K Weier M |
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Institution: | (1) Inorganic Materials Research Program, Queensland University of Technology 2 George Street, Brisbane, GPO Box 2434, Queensland 4001, Australia E-mail |
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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. Moolooite as the natural copper(II) oxalate mineral
is a classic example. High resolution thermogravimetry coupled to evolved gas mass spectrometry shows decomposition takes
place at 260°C. Evolved gas mass spectrometry shows the gas lost at this temperature is carbon dioxide. No water evolution
was observed, thus indicating the moolooite is the anhydrous copper(II) oxalate as compared to the synthetic compound which
is the dihydrate. The high resolution thermogravimetry was complimented with hot stage Raman spectroscopy. The temperature
at which no intensity remains in the bands assigned to the oxalate vibrations is the upper limit of the stability of the moolooite.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | oxalate Raman spectroscopy copper(II) oxalate evolved gas mass spectrometry high resolution thermogravimetry moolooite |
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