Abstract
The reaction process and the optimum preparation conditions of the M‐type calcium ferrite by the chemically coprecipitated method were studied using differential thermal, thermogravimetric, and X‐ray analyses. It is found that the formation mechanism using the coprecipitated method is the same as that of the solid‐state reaction, and the precursor CaO·2Fe2O3 cannot be avoided, but it could be formed at lower temperature. The defect structure based on the replacement of Ca2+ by La3+, the charge compensation by Fe2+, and release of oxygen is supported by the DTA/TGA and conductivity data. The conductivity is suggested to occur through a hopping mechanism. The estimated values of the activation energy based on the small‐polaron conduction are 0.34 to 0.44 eV in the high‐temperature region and 0.029 to 0.049 eV in the low‐temperature region. The preexponential factor depends exponentially on the fraction of the M phase in the specimen.
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