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Influence of the simultaneous addition of magnesium and zirconium cations on the gamma-theta-alpha transformation in alumina

Abstract : This paper concerns a study of the simultaneous addition to a mixture of gamma- and delta-alumina of Mg and Zr, which are known to accelerate and inhibit the transformation to theta- and alpha-alumina. The doped powders were calcined at 1105 °C and the alpha-phase content determined by XRD, and the surface area by the BET method. The best surface area stabilisation (60 m2/g) was obtained for alumina co-doped with 1% Mg and 0.5% Zr. The highest and lowest conversion to alpha-alumina were observed for a single additive, Mg and Zr respectively. Mg was found to enhance the theta-to-alpha transformation rate and to inhibit the formation of the theta-form from the gamma- and delta-phases. With Zr both the formation of theta and alpha were inhibited.
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https://hal-emse.ccsd.cnrs.fr/emse-00610515
Contributor : Andrée-Aimée Toucas <>
Submitted on : Friday, July 22, 2011 - 11:31:33 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:16 PM

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  • HAL Id : emse-00610515, version 1

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Marc Dauzat, Michèle Pijolat, Michel Soustelle. Influence of the simultaneous addition of magnesium and zirconium cations on the gamma-theta-alpha transformation in alumina. Science of Ceramics, Science of ceramics 11, 1987, 14, pp.491-495. ⟨emse-00610515⟩

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