Phase Diagram of Iron-Cobalt-Oxygen System. (I) Experimental Study
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概要
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Phase diagram of iron-cobalt-oxygen has been established experimentally in certain temperature, pressure, and composition ranges (900℃〜1400℃, 10^<-4>〜760mmHg, Fe_<1-x>Co_z〜Oxygen, 0≦x≦1/3). In these ragges, when the temperature and the mixing ratio of metallic elements are fixed, it has been found that spinel phase is stable below a certain critical pressure of oxygen. Above this pressure, precipitates of hematite are formed in the spinel matrix, resulting in an abrupt increase of the total oxygen content in the solid phases. The phase boundary was determined by observing the change of the oxygen pressure in a sealed tube, which resulted from the oxidation or reduction of the specimen. Results of several measurements of specific heat on heating from 100℃ to 750℃, the variations in oxygen content during heat-treatment, and the change of lattice constants at room temperature with heat-treatment, are presented. Curves of lattice constants vs composition of metallic constituents have a minimum at compositions intermediate between magnetite and cobait ferrite. It has been concluded that the diffusion rate of ions in these oxides varies exponentially in passing through the temperature range around 300℃. No result has been obtained which are favourable for the existence of structural change in the temperature range from 200℃ to 400℃ (effective range for magnetic anneal), for all these ferrites.
- 社団法人日本物理学会の論文
- 1956-08-05
著者
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Iida Shuichi
Department Of Physics Faculity Of Science University Of Tokyo
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IIDA Shuichi
Department of Physics Faculty of Science, University of Tokyo
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