Cr<sup>3+</sup>掺杂对h-LuMnO<sub>3</sub>晶格畸变和磁有序的影响

doi:10.11896/cldb.24070037

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Abstract In this work, a series of LuMn_1-xCr_xO₃ (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 LuMn_1-xCr_xO₃ 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 LuMn_1-xCr_xO₃ (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 LuMn_1-xCr_xO₃ samples was due to competition between Mn³⁺ ion trimerization, ferromagnetism double exchange and antiferromagnetic super exchange, in which the antiferromagnetic super exchange of Mn³⁺-O^2--Mn³⁺、Mn⁴⁺-O^2--Mn⁴⁺ and Cr³⁺-O^2--Cr³⁺ predominate.

Key words： LuMnO₃ structure distortion Williamson-Hall-isotropic strain model antiferromagnetic super exchange interaction magnetic order

Published: 10 October 2025 Online: 2025-09-24

CLC number:	O469
	O441

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	CAO Hefang
	ZHANG Aimei
	LYU Jinbin
	LI Qiang
	SHENG Xingxing

Cite this article:

CAO Hefang,ZHANG Aimei,LYU Jinbin, et al. Effect of Cr³⁺ Doping on Lattice Distortion and Magnetic Order of h-LuMnO₃[J]. Materials Reports, 2025, 39(19): 24070037-5.

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https://www.mater-rep.com/EN/10.11896/cldb.24070037 OR https://www.mater-rep.com/EN/Y2025/V39/I19/24070037

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