Crystal structure, magnetic properties and magnetocaloric effects (MCE) of La1–xBixFe11.4Si1.6(x=0.0 and 0.1) compounds were investigated by X-ray diffraction and magnetization measurements. The La1–xBixFe11.4Si1.6compounds presented a cubic NaZn13 type structure. First, the magnetization behavior and the magnetic transition were analyzed in terms of Landau theory. Then, Bi sub-stitution for La in La1–xBixFe11.4Si1.6compounds led to a decrease in magnetic entropy change (maxM?ΔS) but an increase in Curie tem-perature (TC) significantly. The significant increase ofTC by Bi substitution from 202.5 to 256 K forx=0.0 andx=0.1 respectively was attributed to an increase in the Fe-Fe exchange interactions. Moreover, magnetocaloric effect was calculated in terms of isothermal magnetic entropy change. The maximum values of (maxM?ΔS) of La1–xBixFe11.4Si1.6forx=0.0 and 0.1 compounds were found to be, re-spectively, 22.56 and 4.36 J/(kg·K) under an applied magnetic field change of 5 T. For the same applied magnetic field (μ0H=5 T), the relative cooling power (RCP) values were found to vary between 487 and 296 J/kg.
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