Crystal Structure, Magnetic Properties And Magnetocaloric Effect In NaZn₁₃-Type La_1-zCe_z(Fe_1-yCo_y)_13-xSi_x Compounds

Cubic NaZn₁₃-type compounds La(Fe_xM_1-x)₁₃ (M=A1, Si) were promising candidate for magnetic refrigerant due to their low cost, friendly environment and large magnetocaloric effect. Magnetic properties, magnetocaloric effect, itinerant-electron metamagnetic (IEM) transition properties, and the effect of different annealed time on the ingots of compounds La_1-zCe_z(Fe_1-yCo)y))(13-x)Si_x were investigated systematically by substituting other atoms for the rare earth and Fe sites. The main results were as follows:Magnetic properties, magnetocaloric effect, and the effect of different annealed time on the ingots of compounds La_0.8Ce_0.2(Fe_1-xCo_x)_10.5Si₂₀₅ (x=0, 0.02, 0.04, 0.06) were studied. The substitution of Ce for La in La_0.8Ce_0.2(Fe_1-xCo_x)_10.5Si_2.5 shorten the annealed time obviously. The crystal lattice aberration and more vacancies were produced after the substitution of Ce for La in these compounds. This would be propitious to the diffuse of vacancy mechanism, and accordingly the chemical...