鉄塩の分解および酸化鉄粉の加熱による比表面積変化

抄録

The surface behaviors of the iron oxides in loose powder mass were studied. The results from the following three experiments are described: (i) Measurement of the specific surface area of iron oxides produced by the thermal decomposition of iron salts, (ii) the changes of the specific surface area of iron oxide powder by heating at constant temperatures, (iii) the densification of iron oxides. All the experiments were conducted under atmospheric pressure. By heating Fe (III) salts, the surface area of oxides suffered regular changes, but in the case of Fe (II) salts, random changes of the surface area were observed. The rate of contraction of the surface area of iron oxides by heating can be described by the next formula; −dV_t⁄dt=kV_t, and its activation energy is about 10 kcal/gmole.