Thermal analysis of synthetic reevesite and cobalt substituted reevesite (Ni,Co)6Fe2(OH)16(CO3)•4H2O


Autoria(s): Bakon, Kathleen H.; Palmer, Sara J.; Frost, Ray L.
Data(s)

01/04/2010

Resumo

The mineral reevesite and the cobalt substituted reevesite have been synthesised. The d(003) spacings of the minerals ranged from 7.54 to 7.95 Å. The maximum d(003) value occurred at around Ni:Co 0.4:0.6. This maximum in interlayer distance is proposed to be due to a greater number of carbonate anions and water molecules intercalated into the structure. The stability of the reevesite and cobalt doped reevesite was determined by thermogravimetric analysis. The maximum temperature of the reevesite occurs for the unsubstituted reevesite and is around 220°C. The effect of cobalt substitution results in a decrease in thermal stability of the reevesites. Four thermal decomposition steps are observed and are attributed to dehydration, dehydroxylation and decarbonation, decomposition of the formed carbonate and oxygen loss at ~807 °C. A mechanism for the thermal decomposition of the reevesite and the cobalt substituted reevesite is proposed.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/31839/

Publicador

Kluwer

Relação

http://eprints.qut.edu.au/31839/2/31839.pdf

DOI:10.1007/s10973-009-0145-x

Bakon, Kathleen H., Palmer, Sara J., & Frost, Ray L. (2010) Thermal analysis of synthetic reevesite and cobalt substituted reevesite (Ni,Co)6Fe2(OH)16(CO3)•4H2O. Journal of Thermal Analysis and Calorimetry, 100(1), pp. 125-131.

Direitos

Copyright 2010 Kluwer

Fonte

Chemistry; Faculty of Science and Technology

Palavras-Chave #030603 Colloid and Surface Chemistry #030600 PHYSICAL CHEMISTRY (INCL. STRUCTURAL) #030606 Structural Chemistry and Spectroscopy #030602 Chemical Thermodynamics and Energetics #hydrotalcite, brucite, Raman microscopy, carrboydite, hydrohonessite, takovite, mountkeithite.
Tipo

Journal Article