The present paper describes microstructure, X-ray diffraction, microhardness and reduction test of calcium ferrites existed in the Ca O-Fe O-Fe₂O₃ ternary system.
The results obtained are as follows-
1. In the identification of calcium ferrites, four calcium ferrites can be identified by the use of the polarization by reflection microscopy and the use of some etchants.
2. On the results of X-ray diffraction, interplanar spacings are computed by use of Bragg's equation.
3. From the results of the measurement of the microhardness for each specimen, it may be used for supplemental method of the identification by microscopy.
4. In the reduction test, it was recognized that the reducibility of calcium ferrites was good comparable with binary calcium ferrites reported formerly.