Effect of Chromium Substitution on Microstructure and Magnetic Properties of La_0.7Sr_0.2Ba_0.1Mn_1-xCr_xO₃ (x = 0, 0.03, 0.05, 0.07, 0.1)

Abstract:

Structure, morphology, and magnetic properties of perovskite La_0.7Sr_0.2Ba_0.1Mn_1-xCr_xO₃ (x = 0; 0.03; 0.05; 0.07 and 0.1) synthesized via sol-gel method have been studied. X-ray diffraction studies confirm the Rhombohedral structure with R-3c space groups for all samples. The magnetization measurements clearly show that magnetization decreases with increasing Cr substitution concentration. The partial substitution of Cr³⁺ in the Mn site weakens the ferromagnetic double exchange interaction of the Mn³⁺–O–Mn⁴⁺ bond. It is caused by the emergence of the Cr³⁺–O–Cr³⁺ antiferromagnetic interaction. As known, the structural parameters affect the magnetic properties of perovskite manganese materials in the double exchange interaction. As the Cr³⁺ concentration increases, the average Mn-O bond length also increases, and the average Mn-O-Mn bond angle decreases, which dramatically weakens the Mn³⁺–O–Mn⁴⁺ double exchange interaction.

• Periodical: Solid State Phenomena (Volume 345)
• Pages: 71-75
• DOI: https://doi.org/10.4028/p-9vtzmR
• Online since: July 2023
• Authors: Dicky Rezky Munazat, Budhy Kurniawan*, Trians Aprilianto, Maykel Manawan
• Keywords: Chromium Substitution, Double Exchange, Magnetic Properties, Perovskite Manganite

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