Effect of Cr3+ Doping on Lattice Distortion and Magnetic Order of h-LuMnO3
CAO Hefang1,*, ZHANG Aimei2, LYU Jinbin1, LI Qiang1, SHENG Xingxing1
1 College of Biomedical Engineering, Xinjiang Second Medical College, Karamay 834000, Xinjiang, China 2 School of Mechanics and Engineering Science, Hohai University, Nanjing 210000, China
Abstract: In this work, a series of LuMn1-xCrxO3 (0≤x≤0.15) samples were prepared by conventional solid-state reaction method, and the effect of Cr3+ on the lattice distortion and magnetic properties LuMnO3 were investigated. The XPS results showed that the Cr element in LuMn1-xCrxO3 was positive trivalent, and Cr3+ doping would induce the transformation of Mn3+ ions into Mn4+ ions, leading to a lower Mn3+ to Mn4+ ratio. The results of XRD showed that the samples were hexagonal structure. The changes of Mn-O bond lengths and Mn-O-Mn bond angles indicated that the tri-merization of Mn3+ ions was weakened and the tilting angle of MnO5 bipyramids was decreased. The results of Raman scattering are mutually ve-rified with the XRD results. The temperature dependence on magnetization (M-T) curves proved that weak ferromagnetism exists in the samples. At the same time, the antiferromagnetic transition temperature of LuMn1-xCrxO3 (0≤x≤0.1) samples was enhanced from 91 K to 106 K with the increase of Cr3+ doping concentration, indicating that the antiferromagnetic order was enhanced by the Cr3+ doping. The enhancement of antiferromagnetic coupling in LuMn1-xCrxO3 samples was due to competition between Mn3+ ion trimerization, ferromagnetism double exchange and antiferromagnetic super exchange, in which the antiferromagnetic super exchange of Mn3+-O2--Mn3+、Mn4+-O2--Mn4+ and Cr3+-O2--Cr3+ predominate.
曹鹤芳, 张爱梅, 吕锦彬, 李强, 绳星星. Cr3+掺杂对h-LuMnO3晶格畸变和磁有序的影响[J]. 材料导报, 2025, 39(19): 24070037-5.
CAO Hefang, ZHANG Aimei, LYU Jinbin, LI Qiang, SHENG Xingxing. Effect of Cr3+ Doping on Lattice Distortion and Magnetic Order of h-LuMnO3. Materials Reports, 2025, 39(19): 24070037-5.
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