人工製及び天然産酸化鐵の還元及び酸化と磁性
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概要
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These experiments were dealt with to illustrate the magnetizing phenomena of iron oxide by the reduction and oxidation. Using ballistic galvanometer and specially wound secondary coil on silica tube, in which sample was packed in definite condition in powder form, inserted in a electric tube furnace which is arranged in a magnetic field obtained by primary coil, the magnetic intensity of the sample at the different temperatures were determined relatively by the amount of the scale deflection. Artificial ferric oxide was prepared from ferric hydrate deposit from irom solution. Artificial and natural Fe_2O_3 were reduced by the current of H_2 gas, coal gas and CO gas at the temperatures varying 10°∿500℃ separately, and measured those magnetic intensities during the magnetizing reaction. At the temperature 180℃∿300℃ the magnetizing reactions begin and attain maximum value at 350℃∿400℃ showing the formation of Fe_3O_4. By the further reduction of the sample, the magnetic intensity increases slowly in the case of H_2 gas and coal gas, and for CO gas it dereases slightly. And artificial Fe_2O_3 is much easily magnetized compared with natural one ; magnetized at lower temperature and shorter time. By the oxidation of the reduced sample at 200℃∿220℃, the magnetic intensity was increased showing maximum value at the same tempreature, and being kept constant up to 300℃ it decreased suddenly from that temperature and diminished at 550℃. This change is owed to the formation of Fe_3O_4 and magnetic Fe_2O_3 at first, and non-magnetic Fe_2O_3 at last. The changes magnetic Fe_2O_3⇾non-magnetic Fe_2O_3 were determined for many samples after the magnetizing reduction and illustrated them by the temperature-magnetic intensity curves. The magnetic intensity of the reduced sample was increased also by heating it in vacum above 600℃ because of the formation of stable magnetic oxide by the heat treatment. Natural or artificial Fe_3O_4 showed magnetic transformation at the temperature of 600℃ where Fe_3O_4 loses magnetic intensity and by cooling recovers it back again tracing the same curve as heating expressing reversible change.
- 社団法人日本鉄鋼協会の論文
- 1933-08-25
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