Thermal decomposition of the synthetic hydrotalcite iowaite
Frost, Ray L., Bouzaid, Jocelyne, Musumeci, Anthony W., Kloprogge, J. Theo, & Martens, Wayde N. (2006) Thermal decomposition of the synthetic hydrotalcite iowaite. Journal of Thermal Analysis and Calorimetry, 86(2), pp. 437-441.
The thermal stability and thermal decomposition pathways for synthetic iowaite have been determined using thermogravimetry in conjunction with evolved gas mass spectrometry. Chemical analysis showed the formula of the synthesised iowaite to be Mg6.27Fe1.73(Cl)1.07(OH)16(CO3)0.336.1H2O and X-ray diffraction confirms the layered structure. Dehydration of the iowaite occurred at 35 and 79°C. Dehydroxylation occurred at 254 and 291°C. Both steps were associated with the loss of CO2. Hydrogen chloride gas was evolved in two steps at 368 and 434°C. The products of the thermal decomposition were MgO and a spinel MgFe2O4. Experimentally it was found to be difficult to eliminate CO2 from inclusion in the interlayer during the synthesis of the iowaite compound and in this way the synthesised iowaite resembled the natural mineral.
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|Item Type:||Journal Article|
|Keywords:||Dehydration, Dehydroxylation, High-Resolution Thermogravimetric Analysis, Hydrotalcite, Iowaite|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2006 Akademiai Kiado Rt. (Springer)|
|Deposited On:||17 Jun 2009 23:35|
|Last Modified:||01 Mar 2012 08:17|
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