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<p>In this study, the magnetocaloric effect of Ba<sub>2-x</sub>A<sub>x</sub>FeMoO<sub>6</sub> (A = Sm, Ag and x = 0.0, 0.025) has been modeled. The samples exhibit a second-order transition from ferromagnetic (FM) to paramagnetic (PM) states at transition temperatures (T<sub>C</sub>) of approximately 310 K, 322 K, and 304 K for the Ba<sub>2</sub>FeMoO<sub>6</sub> (BFMO), Ba<sub>1.975</sub>Ag<sub>0.025</sub>FeMoO<sub>6</sub> (BAFMO), and Ba<sub>1.975</sub>Sm<sub>0.025</sub>FeMoO<sub>6</sub> (BSFMO) samples, respectively. Investigation the magnetocaloric effect (MCE) in these samples involved simulating the change in magnetic entropy (− ΔS<sub>M</sub>). The critical exponents, β, γ, and δ were obtained using a numerical method grounded in Landau free energy within the mean-field approximation; the simulated outcomes strongly correlate with the experimental data.</p>

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Critical behavior and magnetocaloric effect of Ba2-xAxFeMoO6 (A = Sm, Ag, x = 0.0, 0.025) simulated by Landau theory

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Zahra Ghorbani,
  • Mohammad Hossein Ehsani,
  • Mohamed Hsini,
  • Pengyu Ji,
  • Yingde Zhang,
  • Hong-Guang Piao

摘要

In this study, the magnetocaloric effect of Ba2-xAxFeMoO6 (A = Sm, Ag and x = 0.0, 0.025) has been modeled. The samples exhibit a second-order transition from ferromagnetic (FM) to paramagnetic (PM) states at transition temperatures (TC) of approximately 310 K, 322 K, and 304 K for the Ba2FeMoO6 (BFMO), Ba1.975Ag0.025FeMoO6 (BAFMO), and Ba1.975Sm0.025FeMoO6 (BSFMO) samples, respectively. Investigation the magnetocaloric effect (MCE) in these samples involved simulating the change in magnetic entropy (− ΔSM). The critical exponents, β, γ, and δ were obtained using a numerical method grounded in Landau free energy within the mean-field approximation; the simulated outcomes strongly correlate with the experimental data.