Interdiffusion in the MgO-Al2O3 spinel with or without some dopants

P. Zhang, T. Debroy, S. Seetharaman

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With a view to seek an improved understanding of the DIMOX process, interdiffusion of polycrystalline MgO and Al2O3 in the temperature range 1473 to 1873 K. was studied by diffusion couple experiments. The interdiffusivities in the spinel layer were calculated as functions of composition and temperature. The spinel portion of the phase diagram in the system MgO-Al2O3 was determined from carefully measured compositions at the phase boundaries, and the low temperature spinel region of the phase diagram was confirmed from the present results. For Zn2+ as dopant in alumina, the growth rate of spinel thickness seems to increase when compared with that of the diffusion couples without dopant. The samples containing Si4+ as dopant reveal the formation of a glass phase, and the effect of Si4+ on the diffusion process appears to be negligible.

Original languageEnglish (US)
Pages (from-to)2105-2114
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number8
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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