酸化鐵と酸化マンガンの固體反應に關する研究 (I)

概要

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Products of solid reactions, which take place between Fe_2O_3 and Mn_3O_4 when the mixtures of the oxides are heated at a high temperature, are ferro-magnetic when quenched from that temperature. The authors studied these reactions systematically by magnetic measurement. According to this study the reactions start at 600℃, and the slow cooling greatly diminishes the ferro-magnetic effect of the reaction products. The variations of the magnetic power of the quenched substances with differences in the composition of the mixtures, heating temperature, duration of the heating and the thoroughness with which the oxides are mixed were carefully studied. It was observed that there is a temperature above which the intensity of magnetization for each mixture ceases to increase as the heating temperature is increased. This temperature is about 900℃ for Fe_2O_3・2Mn_3O_4, 1100℃ for Fe_2O_3・Mn_3O_4, and 1200℃ for 2Fe_2O_3・Mn_3O_4. These results seem to indicate that above such temperatures the reactions between all avaiable oxides are completed. The measurement of Curie points indicated that there areat least four kinds of substances namely, Fe_2O_3・2Mn_3O_4, αFe_2O_3・Mn_3O_4, βFe_2O_3・Mn_3O_4, and 2Fe_2O_3・Mn_3O_4. The transition from α phase to β phase occurs at 990℃. A reaction diagram was tentatively plotted to explain the solid reaction mechanism.
社団法人日本鉄鋼協会の論文
1943-07-25