Authors:
R. Frost Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street

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J. Bouzaid Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street

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A. Musumeci Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street

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J. Kloprogge Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street

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W. Martens Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street Brisbane Australia Queensland 4001 GPO Box 2434 2 George Street

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Abstract  

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 79C. Dehydroxylation occurred at 254 and 291C. Both steps were associated with the loss of CO2. Hydrogen chloride gas was evolved in two steps at 368 and 434C. 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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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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