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<p>In this work, we investigated the XRD patterns, magnetic measurements, and critical phenomena of La<sub>0.8</sub> Na<sub>0.2</sub> Mn<sub>1–<i>x</i></sub> Ga<sub><i>x</i></sub>O<sub>3</sub> (<i>x</i> = 0, 0.025). The samples crystallize in the rhombohedral structure with R-3C symmetry. Magnetic data show that the compounds undergo a ferromagnetic-paramagnetic phase transition around the Curie temperature (<i>T</i><sub>C</sub>). We observed that <i>T</i><sub>C</sub> decreases from 297 to 290&#xa0;K with 0.025 of Ga doping. Additionally, the magnetic entropy change (Δ<i>S</i><sub>M</sub>) reaches its highest values around <i>T</i><sub>C</sub> during the order-disorder transition. At a Magnetic field of 5&#xa0;T, −Δ<i>S</i><sub>M</sub> is 4.5&#xa0;J·kg<sup>−1</sup>·K<sup>−1</sup> for the parent compound and 4.3&#xa0;J·kg<sup>−1</sup>·K<sup>−1</sup> the doped sample. However, the relative cooling power (RCP) increases with the Ga doping, with RCP values of 279&#xa0;J·kg<sup>−1</sup> and 299&#xa0;J·kg<sup>−1</sup> for <i>x</i> = 0 and 0.025 respectively. We confirmed that both materials undergo a second-order magnetic phase transition based on the universal master curve and the Banerjee criteria. From the critical behavior analysis, we found that the samples conform well to the mean-field model with (<i>β </i>= 0.49 and 0.48, <i>γ </i>= 1 and 0.95; <i>δ</i> equal to 2.87 and 3.10 for <i>x</i> = 0 and 0.025, respectively).</p>

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Magnetocaloric Effect and Critical Magnetic Behavior in La0.8 Na0.2 Mn1–x GaxO3 (x = 0, 0.025) Perovskite Manganite

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • M. R. Laouyenne,
  • Mohamed Baazaoui,
  • Fatma Aouaini,
  • Beriham Basha,
  • Kholoud Saad Al-mugren

摘要

In this work, we investigated the XRD patterns, magnetic measurements, and critical phenomena of La0.8 Na0.2 Mn1–x GaxO3 (x = 0, 0.025). The samples crystallize in the rhombohedral structure with R-3C symmetry. Magnetic data show that the compounds undergo a ferromagnetic-paramagnetic phase transition around the Curie temperature (TC). We observed that TC decreases from 297 to 290 K with 0.025 of Ga doping. Additionally, the magnetic entropy change (ΔSM) reaches its highest values around TC during the order-disorder transition. At a Magnetic field of 5 T, −ΔSM is 4.5 J·kg−1·K−1 for the parent compound and 4.3 J·kg−1·K−1 the doped sample. However, the relative cooling power (RCP) increases with the Ga doping, with RCP values of 279 J·kg−1 and 299 J·kg−1 for x = 0 and 0.025 respectively. We confirmed that both materials undergo a second-order magnetic phase transition based on the universal master curve and the Banerjee criteria. From the critical behavior analysis, we found that the samples conform well to the mean-field model with (β = 0.49 and 0.48, γ = 1 and 0.95; δ equal to 2.87 and 3.10 for x = 0 and 0.025, respectively).