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Synthesis, Characterization, and1H and71Ga MAS NMR Spectroscopy of a Novel Mg/Ga Double Layered Hydroxide

Authors
Journal
Journal of Solid State Chemistry
0022-4596
Publisher
Elsevier
Publication Date
Volume
131
Issue
1
Identifiers
DOI: 10.1006/jssc.1997.7347
Disciplines
  • Earth Science
  • Physics

Abstract

Abstract A new brucite-like layered Mg/Ga double hydroxide (LDH) of composition [Mg 0.174Ga 0.256(OH) 2](CO 3) 0.134· mH 2O 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 Ga 2O 3at 823 K. Its changes with temperature were monitored by using 1H and 71Ga 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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