Abstract
Debye-Scherrer X-ray powder photographs and photomicrographs of samples in the MgO-Fe x O system have revealed the possible presence of spinodal decomposition.
Samples of MgO doped with 4.99 cation % iron were quenched from high temperature into water. Debye-Scherrer photographs taken after quenching revealed the presence of satellite lines located adjacent to the main diffraction lines. These lines can be interpreted as due to a periodic fluctuation in lattice parameter. This periodic fluctuation has been described as one of the distinguishing features of spinodal decomposition.
Microstructures of the samples in correlation with electrical conductivity measurements revealed two different types of precipitation depending on sample heat-treatment. The first type reveals MgFe2O4 precipitates at grain-boundaries. The second reveals a grainy precipitate network permeating the structure. The grainy network could be due possibly to growth of precipitates following an initial decomposition of the spinodal type.
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Based on a thesis submitted by S. K. Evans for the Ph.D. degree in ceramic engineering, University of Utah, September 1965.
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Evans, S.K., Cutler, I.B. Precipitation of magnesium ferrite from MgO-FexO solid solutions. J Mater Sci 5, 141–148 (1970). https://doi.org/10.1007/BF00554632
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DOI: https://doi.org/10.1007/BF00554632