Crystal Structure and Magnetic Properties of La_0.8R_0.2(Fe_0.88Si_0.12)₁₃ (R = Sm and Tb) Compounds

抄録

This study discusses the crystal structure and magnetic properties of the rare-earth doped La_0.8R_0.2(Fe_0.88Si_0.12)₁₃ (with R = Sm, Tb) compounds. All the samples were prepared by using arc-melting technique in argon atmosphere and the obtained result shows that after heat treatment, the samples exhibited the NaZn₁₃-type cubic phase with a small amount of a secondary α-Fe phase. The magnetic properties and magnetic entropy change were determined by mean of the temperature and field dependence magnetizations. Besides the decrease in the lattice constants, there was also observed a significant increase of Curie temperature and magnetic entropy change −ΔS_M which reached a maximum of 4.5 J/kg K for La_0.8Sm_0.2(Fe_0.88Si_0.12)₁₃, corresponding to a relative cooling powers (RCP) of 102 J/kg for the sample.