Kinetics of the Internal Oxidation of (Mg, Fe)O Solid Solutions

WILLIAM LUECKE, David L Kohlstedt

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Single crystals of Mg1‐xFexO,x= 0.01, have been oxidized in air at temperatures between 1146 and 1389 K to determine the kinetics of the internal oxidation reaction. A two‐phase region composed of MgFe2O4 precipitates in a (Mg, Fe)O matrix grows inward from the surface as the reaction progresses. The thickness of this layer as a function of time has been determined by optical microscopy; the growth kinetics are parabolic. In addition, an external oxide layer of (Mg, Fe)O grows outward from the original surface. The thickness of this external oxide layer as a function of time was determined by following the displacement of inert markers with Rutherford backscattering spectrometry; the kinetics of the growth of this external layer are also parabolic in time. The parabolic reaction rate constant determined for the growth of the external layer accurately predicts that for the growth of the internally oxidized region.

Original languageEnglish (US)
Pages (from-to)189-196
Number of pages8
JournalJournal of the American Ceramic Society
Volume71
Issue number3
DOIs
StatePublished - Jan 1 1988

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Internal oxidation
solid solution
Solid solutions
oxidation
kinetics
Oxides
Growth kinetics
Rutherford backscattering spectroscopy
Spectrometry
Reaction rates
Optical microscopy
oxide
Precipitates
Rate constants
Single crystals
reaction rate
spectrometry
microscopy
Air
crystal

Cite this

Kinetics of the Internal Oxidation of (Mg, Fe)O Solid Solutions. / LUECKE, WILLIAM; Kohlstedt, David L.

In: Journal of the American Ceramic Society, Vol. 71, No. 3, 01.01.1988, p. 189-196.

Research output: Contribution to journalArticle

LUECKE, WILLIAM ; Kohlstedt, David L. / Kinetics of the Internal Oxidation of (Mg, Fe)O Solid Solutions. In: Journal of the American Ceramic Society. 1988 ; Vol. 71, No. 3. pp. 189-196.
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