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Abstract <p>The prospect of La<sub>0.8</sub>Ca<sub>0.2</sub>Mn<sub>1–<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> (0 ≤ <i>x</i> ≤ 0.3) perovskite oxides as magnetocaloric effect (MCE) based magnetic refrigerant has been explored. A phenomenological model has been employed to investigate various magnetocaloric properties, including magnetic entropy change (∆<i>S</i>), heat capacity change (∆<i>C</i>), full width at half band width (δ<i>T</i><sub>FWHM</sub>), adiabatic temperature change (Δ<i>T</i><sub>ad</sub>) and relative cooling power (RCP) through the study of temperature dependence of magnetization. Using this model, the magnetocaloric property values are predicted by calculating the magnetization data under varying external magnetic fields. Since magnetization reduces abruptly near <i>T</i><sub>C</sub> a significant change in magnetic entropy change, heat capacity change and adiabatic temperature change occur. We observe as the doping concentration increases an enhancement in the predicted values of magnetocaloric parameters occur with the increasing magnetic field possibly due to the switching of the magnetic phase transition (MPT) in the material from first to second order. Thus, the results highlight the compounds as strong contenders for cooling applications across a broad range around room temperature. Moreover, the analysis affirms the extent of validity of the phenomenological model.</p>

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Investigation of Magnetocaloric Properties and Magnetic Phase Transition in Cobalt-Doped La0.8Ca0.2MnO3 Perovskites Using a Phenomenological Model

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • B. Dey,
  • A. Basu,
  • S. Pal,
  • S. Kumar

摘要

Abstract

The prospect of La0.8Ca0.2Mn1–xCoxO3 (0 ≤ x ≤ 0.3) perovskite oxides as magnetocaloric effect (MCE) based magnetic refrigerant has been explored. A phenomenological model has been employed to investigate various magnetocaloric properties, including magnetic entropy change (∆S), heat capacity change (∆C), full width at half band width (δTFWHM), adiabatic temperature change (ΔTad) and relative cooling power (RCP) through the study of temperature dependence of magnetization. Using this model, the magnetocaloric property values are predicted by calculating the magnetization data under varying external magnetic fields. Since magnetization reduces abruptly near TC a significant change in magnetic entropy change, heat capacity change and adiabatic temperature change occur. We observe as the doping concentration increases an enhancement in the predicted values of magnetocaloric parameters occur with the increasing magnetic field possibly due to the switching of the magnetic phase transition (MPT) in the material from first to second order. Thus, the results highlight the compounds as strong contenders for cooling applications across a broad range around room temperature. Moreover, the analysis affirms the extent of validity of the phenomenological model.