Synthesis and Magnetic Properties of Fe7C3 Particles with High Saturation Magnetization
- 1 April 1990
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 29 (4R) , 662-668
- https://doi.org/10.1143/jjap.29.662
Abstract
The formation behavior and magnetic properties of Fe7C3 particles were investigated under atmospheric pressure. The starting material of barium-containing iron oxide was carbureted with CO by heat treatment. Fe7C3 particles were formed in the reaction temperature range of 300–375°C along with a small amount of Fe5C2 particles. Fe7C3 content in the product increased with the increase in the partial pressure of CO and the decrease in the reaction temperature. DTA-TG analysis revealed that the product contained about 5–10 wt% free carbon. The saturation magnetization of the product was about 110 emu/g regardless of the reaction conditions. The coercivity and the ratio of the residual magnetization to the saturation magnetization increased with the increase of the Fe7C3 content in the product.Keywords
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