“…For a hydrotalcite-like compound with the ratio of Mg/Al = 2, it is expected that a second phase appears between 180 and 200 °C. The formation of this phase was proved by a mass loss in thermogravimetric analysis (TGA) curves and its corresponding endothermic effects on differential thermal analysis (DTA) curves, up to 180 or 200 °C. ,,,,− Moreover, the mass loss is accompanied by a decrease of the basal distance ( d -spacing) from 7.59 to 6.6 Å . Some authors interpret these data from TG and XRD analyses as a result of dehydration of the interlayer region, ,,, while other researchers explain the same observations not only by dehydration but also by the decarbonation that could occur simultaneously. ,,, In this latter proposal, the water molecules and the carbonate anions intercalated combine to form carbon dioxide and hydroxyl ions (CO 3(interlayer) 2– + H 2 O → CO 2 (g) + 2OH (interlayer) – ).…”