Abstract
We report the enhancement of the refrigerant capacity (RC) and the working temperature span (δTFWHM) in (La2/3Ba1/3MnO3)1−x/ (La2/3 Ba1/3 MnO2.98)x composite. La2/3Ba1/3MnO3 and La2/3 Ba1/3MnO2.98 manganites are characterized, respectively, by Curie temperatures TC = 336.8 and 310 K near room temperature. The temperature dependence of the isothermal magnetic entropy change ΔS(T) has been calculated for the composite system with 0 ≤ x ≤ 1. We have shown that the full-width at half maximum of the ΔS(T) curve in La2/3Ba1/3MnO3 manganite may be significantly increased via a composite made of both samples with different values of TC. The optimum MCE at µ0H = 1 T has been found in the temperature interval of 299–349 K for the composite with x = 0.5. Even though the maximum value of ΔS for the composite is lower than those of the individual materials, the existence of a flattening behavior maximizes the refrigerant capacity, reaching values around 76.83 J/kg for an applied magnetic field change of 1 T. An optimal molar composite was simulated to be considered as a refrigerant material in a magnetic refrigerator performing an Ericsson cycle near room temperature. These results make the (La2/3Ba1/3MnO3)0.5/(La2/3Ba1/3MnO2.98)0.5 composite promising materials for the practical magnetic refrigeration using a lower field (1 T) which is much easier to generate by permanent magnets than higher fields like 2 T.
Published Version
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