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In situ phase equilibria determination of a manganese ferrite by electrical means

Published online by Cambridge University Press:  31 January 2011

Han-Ill Yoo  and
Harry L. Tuller
Han-Ill Yoo
Affiliation:
Department of Inorganic Materials Engineering, Seoul National University, Seoul 151, Korea
Harry L. Tuller
Affiliation:
Crystal Physics and Optical Electronics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology. Cambridge, Massachusetts 02139
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Abstract

Electrical conductivity and thermoelectric power have been measured for a series of MnZn ferrites as functions of the oxygen partial pressure under high-temperature equilibrium conditions. The isothermal variation of both properties was successfully correlated to the onset of phase transitions at characteristic Po2's. The ferrite 0.482MnO-0.518Fe2O3 was examined in some detail to locate the stability fields of the metallic alloy of iron and manganese, manganowustite, the spinel ferrite, and the hematitelike phase, and to extract the appropriate free-energy data. The results confirmed by x-ray diffraction are in satisfactory agreement with literature data.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 3 , June 1988 , pp. 552 - 556
Copyright
Copyright © Materials Research Society 1988

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References

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