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
Papers

Abstract

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.

Keywords

Chromium Solid Solution Electron Spin Resonance Magnetic Susceptibility Electron Diffraction 

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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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