Abstract
Bi doped lanthanum manganites with the chemical composition of La 0.67− x Bi x Ca 0.33MnO 3 ( x = 0 , 0.05, 0.1, 0.2) were prepared by the standard solid-state process. The Curie temperatures were measured to be 267 K for x = 0 , 248 K for x = 0.05 , 244 K for x = 0.1 and 229 K for x = 0.2 samples. It was found that the maximum value of the magnetic entropy change ∣Δ S m ∣ has reached the highest value of 6.08 J/kg K at 3 T for the composition with x = 0.05 . Nearly the same maximum entropy change was observed for the x = 0 sample. A large decrease in the magnitude of the entropy change was observed for the x = 0.2 sample.
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