Thermal decomposition of the hydrotalcite |
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| Authors: | R L Frost W N Martens Kristy L Erickson |
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| Institution: | (1) Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia;(2) Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia;(3) Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia |
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| Abstract: | Summary A combination of thermogravimetry and hot stage Raman spectroscopy has been used to study the thermal decomposition of the
synthesised zinc substituted takovite Zn6Al2CO3(OH)16·4H2O. Thermogravimetry reveals seven mass loss steps at 52, 135, 174, 237, 265, 590 and ~780°C. MS shows that the first two mass
loss steps are due to dehydration, the next two to dehydroxylation and the mass loss step at 265°C to combined dehydroxylation
and decarbonation. The two higher mass loss steps are attributed to decarbonation. Raman spectra of the hydroxyl stretching
region over the 25 to 200°C temperature range, enable identification of bands attributed to water stretching vibrations, MOH
stretching modes and strongly hydrogen bonded CO32--water bands. CO32- symmetric stretching modes are observed at 1077 and 1060 cm-1. One possible model is that the band at 1077 cm-1is ascribed to the CO32- units bonded to one OH unit and the band at 1092 cm-1is due to the CO32- units bonded to two OH units from the Zn-takovite surface. Thermogravimetric analysis when combined with hot stage Raman spectroscopy
forms a very powerful technique for the study of the thermal decomposition of minerals such as hydrotalcites.</o:p> |
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| Keywords: | hydrotalcite thermogravimetry thermal analysis takovite Raman spectroscopy iowaite desautelsite stitchtite |
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