Low-field magnetocaloric effect of $$\hbox {NdFe}_{11}\hbox {Ti}$$ and $$\hbox {SmFe}_{10}\hbox {V}_{2}$$ compounds

To substitute NdFeB in many fields, the 1–12 phase is actively studied. That’s the reason why magnetic and magnetocaloric properties of $$\hbox {ThMn}_{12}$$ have been investigated. $$\hbox {NdFe}_{11}\hbox {Ti}$$ and $$\hbox {SmFe}_{10}\hbox {V}_2$$ were synthesized form bulk materials by arc melting and reduced into a powder by high energy ball milling to obtained a nanometric powder. Then, the powder was annealed in a furnace at different temperatures to crystallize the phase. Rietveld refinement showed that these two alloys crystallized in a $$\hbox {ThMn}_{12}$$ tetragonal structure which can be described by the I4/mmm space group. We found $$T_{C}=552\,\hbox {K}$$ , $$\mu _0H_C=1.2\times 10^{-2}\,\hbox {T}$$ , $$RCP=42\,\hbox {J.kg}^{-1}$$ for $$\hbox {NdFe}_{11}\hbox {Ti}$$ and $$T_{C}=603\,\hbox {K}$$ , $$\mu _0H_C=0.4\,\hbox {T}$$ , $$RCP=46\,\hbox {J.kg}^{-1}$$ for $$\hbox {SmFe}_{10}\hbox {V}_{2}$$ . It can be assumed that $$\hbox {SmFe}_{10}\hbox {V}_2$$ is a hard magnet but not $$\hbox {NdFe}_{11}\hbox {Ti}$$ , both could be used as heat-pump.