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<p>The search for efficient magnetic refrigerants near room temperature is still motivating the scientific committee. In this context, we have tried to study the effect of annealing temperature on the structural, magnetic and magnetocaloric properties of the La<sub>0.75</sub>Dy<sub>0.05</sub>Sr<sub>0.2</sub>MnO<sub>3</sub> compound, synthesized by the sol–gel method. The structural analysis revealed the coexistence of both rhombohedral <i>R</i> <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8567_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\(\overline{3 }\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>3</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> <i>c</i> and orthorhombic <i>Pnma</i> structural phases, with the presence of some impurities for the nanosized compound sintered at 800&#xa0;°C. All the samples display a ferromagnetic–paramagnetic transition, with the presence of a glassy state at low temperatures. Reducing the sintering temperature from 1200&#xa0;°C to 1000&#xa0;°C shifts the Curie point to higher temperatures, which can be linked to the weakening of superexchange interactions. The results of the magnetocaloric study show that the compound sintered at 1000&#xa0;°C exhibits an important relative cooling power (80.05&#xa0;J.kg<sup>−1</sup>) under a magnetic field of 2&#xa0;T at 285&#xa0;K, which suggests that this compound is a potential candidate for magnetic cooling near room temperature.</p>

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Annealing temperature effects on the structural and magnetocaloric properties of La0.75Dy0.05Sr0.2MnO3

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • M. Baccari,
  • A. Elghoul,
  • A. Krichene,
  • W. Boujelben,
  • N. Chniba Boudjada

摘要

The search for efficient magnetic refrigerants near room temperature is still motivating the scientific committee. In this context, we have tried to study the effect of annealing temperature on the structural, magnetic and magnetocaloric properties of the La0.75Dy0.05Sr0.2MnO3 compound, synthesized by the sol–gel method. The structural analysis revealed the coexistence of both rhombohedral R \(\overline{3 }\) 3 ¯ c and orthorhombic Pnma structural phases, with the presence of some impurities for the nanosized compound sintered at 800 °C. All the samples display a ferromagnetic–paramagnetic transition, with the presence of a glassy state at low temperatures. Reducing the sintering temperature from 1200 °C to 1000 °C shifts the Curie point to higher temperatures, which can be linked to the weakening of superexchange interactions. The results of the magnetocaloric study show that the compound sintered at 1000 °C exhibits an important relative cooling power (80.05 J.kg−1) under a magnetic field of 2 T at 285 K, which suggests that this compound is a potential candidate for magnetic cooling near room temperature.