In this paper, the initial susceptibility of e-Fe 3 N magnetic fluid at volume concentrations in the range F = 0.0~0.0446 are measured. Compared with the experimental initial susceptibility, the Langevin, Weiss and Onsager susceptibility were calculated using the data obtained from the low concentration e-Fe 3 N magnetic fluid samples. The viscosity of the e-Fe 3 N magnetic fluid at the same concentrations is measured. The result shows that, the initial susceptibility of the low concentration e-Fe 3 N magnetic fluid is proportional to the concentration. A linear relationship between relative viscosity and the volume fraction is observed when the concentration F < 0.02.
The structures, magnetic properties, and magnetic-entropy-changes of La1−zRz(Fe1−x−yCoxAly)13 (R=Ce, Pr, Nd, Sm, Gd, and Dy) were studied. It was found that the crystal structures of La(Fe0.73−xCoxAl0.27)13 maintain the LaCo13-type cubic structure. The relationship between saturation magnetic moments per 3d atom and the number of 3d electrons in the compounds of La(Fe0.73−xCoxAl0.27)13 system can be explained by the rigid-band model at Co-rich side and disagrees with the model at Fe-rich side. When 0.02≤x≤1.0, the compounds have a nearby room temperature Curie temperature, a high saturation magnetization and a high magnetic-entropy-change. When x=0.02 and the external magnetic field is 1.11 MA/m, the maximum magnetic-entropy-change of the La(Fe0.71Co0.02Al0.27)13 compound is 13 kJ/m3⋅K which is about half of that of metal Gd at the same external magnetic field. The saturation magnetization of the compound increases and the maximum magnetic-entropy-change decreases when La is substituted by Ce. The compounds in which La is substituted by other rare-earth elements R (R=Pr, Nd, Sm, Gd, and Dy) decomposed into 1:13-type, 2:17-type, and α-Fe phase. The second rare-earth elements added exist mainly in the 2:17-type phase.
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