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<p>The magnetic and magneto-caloric (MC) behavior of La<sub>0.67-x</sub>Eu<sub>x</sub>Ba<sub>0.33</sub>Mn<sub>0.85</sub>Fe<sub>0.15</sub>O<sub>3</sub> (x = 0.0 and 0.1) nanoparticles has been investigated in this work. The samples under study were prepared using the sol–gel method. Structural analysis, conducted via X-ray diffraction, revealed that the samples crystallize in an orthorhombic structure with a <i>Pbnm</i> space group. The magnetic data indicate that the compounds exhibit a transition from a ferromagnetic (FM) to a paramagnetic (PM) state as the temperature increases. The Curie temperature values are 170&#xa0;K and 100&#xa0;K for x = 0 and 0.1, respectively. At low temperatures and for all samples, the M(µ<sub>0</sub>H) curves at various temperatures show the coexistence of antiferromagnetic domains. The Griffiths phase, identified from the temperature dependence of the inverse susceptibility, is observed in these samples. The magneto-caloric (MC) effect was determined from the magnetization versus applied magnetic field up to 7&#xa0;T at different temperatures (5&#xa0;K ≤ T <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8382_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\le\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>≤</mo> </math></EquationSource> </InlineEquation> 280&#xa0;K). A broadening of the magnetic entropy change peak and low values of (-ΔS<sub>Max</sub>) are highlighted in our samples. For magnetic field µ<sub>0</sub>H = 5&#xa0;T, (-ΔS<sub>Max</sub>) reaches maximum values in the order of 0.90 and 0.59&#xa0;J.K<sup>−1</sup>.kg<sup>1</sup> for x = 0 and 0.1 respectively. Despite the low values of (-ΔS<sub>Max</sub>), important values of the relative cooling power have been observed in our compounds which are 182.81 and 92.72 (JK<sup>−1</sup>) for x = 0 and 0.1 respectively for µ<sub>0</sub>H = 5&#xa0;T.</p>

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Magnetic and magneto-caloric behavior of La0.67-xEuxBa0.33Mn0.85Fe0.15O3 (x = 0.0 and 0.1) nanoparticles

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • A. Ben Jazia Kharrat,
  • W. Boujelben,
  • N. Chniba-Boudjada

摘要

The magnetic and magneto-caloric (MC) behavior of La0.67-xEuxBa0.33Mn0.85Fe0.15O3 (x = 0.0 and 0.1) nanoparticles has been investigated in this work. The samples under study were prepared using the sol–gel method. Structural analysis, conducted via X-ray diffraction, revealed that the samples crystallize in an orthorhombic structure with a Pbnm space group. The magnetic data indicate that the compounds exhibit a transition from a ferromagnetic (FM) to a paramagnetic (PM) state as the temperature increases. The Curie temperature values are 170 K and 100 K for x = 0 and 0.1, respectively. At low temperatures and for all samples, the M(µ0H) curves at various temperatures show the coexistence of antiferromagnetic domains. The Griffiths phase, identified from the temperature dependence of the inverse susceptibility, is observed in these samples. The magneto-caloric (MC) effect was determined from the magnetization versus applied magnetic field up to 7 T at different temperatures (5 K ≤ T \(\le\) ≤ 280 K). A broadening of the magnetic entropy change peak and low values of (-ΔSMax) are highlighted in our samples. For magnetic field µ0H = 5 T, (-ΔSMax) reaches maximum values in the order of 0.90 and 0.59 J.K−1.kg1 for x = 0 and 0.1 respectively. Despite the low values of (-ΔSMax), important values of the relative cooling power have been observed in our compounds which are 182.81 and 92.72 (JK−1) for x = 0 and 0.1 respectively for µ0H = 5 T.