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Solid state characterization of coprecipitated alumina-gallia mixed oxide powders

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Abstract

Powders with composition (Al x Ga 1−x)2O3 (x = 0, 0.25, 0.50, 0.75, 1) have been prepared by coprecipitation from aluminum nitrate and gallium nitrate and have been charaterized after drying at 373 K and calcination at 673, 1073 and 1473 K, using XRD, DTA, FT-IR and diffuse reflectance UV-VIS and BET surface area and porosity measurements. At 373 K Al compounds are essentially amorphous and for the Ga0.75 Al0.25 sample a solubility of 12% of Al3+ in the diaspore type α-GaOOH has been calculated. In samples calcined at 673 and 1073 K for the Al-rich ones a poorly crystalline defective spinel-type phase γ -Al2O3 has been found while the Ga-rich materials are composed of the metastable corundum type phase α-Ga2O3 and the thermodynamically β -Ga2O3 at 673 and 1073 K respectively. Al3+ added to α-Ga2O3 tends to hinder the α→ β phase transition of gallium oxide. At 1473 K mixed oxides give rise the thermodynamically stable α-Al2O3 and β-Ga2O3 phases. Reciprocal solubilities of Ga and Al in their oxides have been calculated.

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Authors and Affiliations

  1. Departamento de Química Inorgánica, Universidad de Salamanca, Pl. de la Merced, s/n, E-37008, Salamanca, Spain

    V. S. Escribano & E. F. López

  2. Departamento de Química Inorgánica, Lab. Complutense de Altas Presiones, Universidad Complutense, Ciudad Universitaria, E-28040, Madrid, Spain

    J. M. G. Amores, M. Panizza & C. Resini

  3. Dipartimento di Ingegneria Chimica e di Processo, Università di Genova, P.le Kennedy 1, I-16129, Genova, Italy

    G. Busca

Authors
  1. V. S. Escribano
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  2. J. M. G. Amores
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  3. E. F. López
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  4. M. Panizza
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  5. C. Resini
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  6. G. Busca
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Correspondence to G. Busca.

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Escribano, V.S., Amores, J.M.G., López, E.F. et al. Solid state characterization of coprecipitated alumina-gallia mixed oxide powders. J Mater Sci 40, 2013–2021 (2005). https://doi.org/10.1007/s10853-005-1225-3

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  • DOI: https://doi.org/10.1007/s10853-005-1225-3

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