Journal of Materials Science

, Volume 3, Issue 3, pp 229–238 | Cite as

Mixed oxides prepared with an induction plasma torch

Part 1 Chromia/alumina
  • T. I. Barry
  • R. K. Bayliss
  • L. A. Lay


Pure and mixed aluminium and chromium oxides have been prepared by passage of the halides through a radio-frequency oxidising plasma. The nature of the materials produced has been assessed by electron microscopy, electron diffraction, X-ray diffraction, magnetic susceptibility, and electron spin resonance. The products ware finely divided solids, containing mostly spherical particles in the size ranga 0.01 to 0.15μm; however, the chromia particles were often hexagonal platelets up to 0.4μm in diameter. The X-ray diffraction patterns were well defined, showingδ-alumina andα-chromia as major phases, andθ-alumina as a minor phase. The maximum degree of solid solution of chromium ions in theδ-alumina was limited to about 6% of the total cation content; solid solution of aluminium ions in theα-chromia phase was below the detection limit of 10%. The nature of the particles, the phases produced, and the degree of solid solution are shown to be consistent with a sequence of condensation which can be predicted from thermodynamic data.


Chromium Solid Solution Electron Spin Resonance Magnetic Susceptibility Electron Diffraction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Chapman and Hall 1968

Authors and Affiliations

  • T. I. Barry
    • 1
  • R. K. Bayliss
    • 1
  • L. A. Lay
    • 1
  1. 1.Inorganic and Metallic Structure DivisionNational Physical LaboratoryTeddingtonUK

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