Thermal Segregation of Cations in Iron Aluminate Spinels

W. T. PETUSKEY, H. K. BOWEN

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Abstract

Thermal segregation experiments were performed on open and encapsulated wafers of Fe(Fe1.51Al0.49)O4 spinels using CO2 laser radiation as a heat source. The correlation of “apparent” marker movement and cation segregation led to the conclusion that the free exchange of gaseous oxygen at the external spinel surfaces is necessary to cause significant redistribution of aluminum and iron in a temperature gradient. This was explained by the different mobilities of different cations in a net vacancy (low. Effectively no segregation was observed for the zero vacancy flux condition.

Original languageEnglish (US)
Pages (from-to)611-617
Number of pages7
JournalJournal of the American Ceramic Society
Volume64
Issue number10
DOIs
StatePublished - Oct 1981
Externally publishedYes

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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