Journal of Materials Science

, Volume 18, Issue 8, pp 2437–2452 | Cite as

High resolution X-ray diffraction of fully and partially magnesium stabilized beta″-alumina ceramics

  • F. Harbach
Papers

Abstract

The dependence of the unit cell size of β″-Al2O3 on its sodium and magnesium content has been stated in the past in a contradictory manner. This situation is clarified on the basis of high resolution Guinier photographs of the X-ray diffraction of fully stabilized ternary β″-Al2O3 ceramics with compositions of Na1+z MgzAl11−zO17. The lattice constant a0 increases with increasing z over the range of 0.5 to 0.8. In contrast, the height H of the conduction slab decreases with increasing z. Both values level off at z ⩾ 0.8. This behaviour is discussed using simple models. The X-ray diffraction patterns of β″-Al2O3 ceramics can show considerable splittings of reflections with high Miller indices / for compositions which do not correspond to the above formula. These splittings can be attributed to the simultaneous presence of two different β″-Al2O3 component phases — a fully and a partially magnesium stabilized one. The excess sodium of the partially stabilized component phase is shown to be charge compensated by interstitial oxygen ions in the conduction slab, which is equivalent to the widely accepted compensation mechanism for the excess sodium of binary β-Al2O3.

Keywords

Al2O3 Component Phase Magnesium Content Miller Index Interstitial Oxygen 

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Copyright information

© Chapman and Hall Ltd. 1983

Authors and Affiliations

  • F. Harbach
    • 1
  1. 1.Brown, Boveri and Cie AG, Zentrales ForschungslaborHeidelberg 1Federal Republic of Germany

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