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Hydrotalcites (crystalline mixed oxides of magnesium and aluminum) were synthesized by the sol-gel method at pH 10. The magnesium source was magnesium ethoxide and the aluminum precursors were aluminum nitrate, aluminum chlorate or aluminum sulfate. The resulting solids were characterized by infrared spectroscopy (FTIR) and thermal analysis (DTA-TGA). It was found that thermal stability depended strongly...
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