Abstract
A new brucite-like layered Mg/Ga double hydroxide (LDH) of composition [Mg0.174Ga0.256(OH)2](CO3)0.134·mH2O was synthesized by coprecipitation at pH 10. The hydroxide and the mixed oxides resulting from its thermal decomposition at 523, 823 and 1073 K were characterized by X-ray diffraction, diffuse reflectance infrared spectroscopy, high-resolution solid-state nuclear magnetic resonance (MAS NMR), and thermogravimetric analysis. The surface properties of the solid (specific surface) and its basicity were also determined. The Mg/Ga LDH was found to be stable up to 523K and to decompose into a mixture of periclase MgO and amorphous Ga2O3at 823 K. Its changes with temperature were monitored by using1H and71Ga MAS NMR;1H MAS NMR spectra revealed the loss of interlayer OH groups supporting the brucite-like structure on calcination at 823K.
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