Insight into the unique structure of layered double hydroxides (LDHs) has been obtained using a combination of X-ray diffraction
and thermal analysis. Indium containing hydrotalcites of formula Mg4In2(CO3)(OH)12·4H2O (2:1 In-LDH) through to Mg8In2(CO3)(OH)18·4H2O (4:1 In-LDH) with variation in the Mg:In ratio have been successfully synthesised. The d(003) spacing varied from 7.83 Å for the 2:1 LDH to 8.15 Å for the 3:1 indium containing LDH. Distinct mass loss steps attributed
to dehydration, dehydroxylation and decarbonation are observed for the indium containing hydrotalcite. Dehydration occurs
over the temperature range ambient to 205 °C. Dehydroxylation takes place in a series of steps over the 238–277 °C temperature
range. Decarbonation occurs between 763 and 795 °C. The dehydroxylation and decarbonation steps depend upon the Mg:In ratio.
The formation of indium containing hydrotalcites and their thermal activation provides a method for the synthesis of indium