LU Ziyi ¹, WANG Jinjun ¹, YANG Tianai ¹, HUANG Jiangtao ¹, YAN Ming ^{1, 2, 3}
(1. College of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, Hubei, China; 2. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, Hubei, China; 3. Collaborative Innovation Center of Green Light-weight Materials and Processing, Hubei University of Technology, Wuhan 430068, Hubei, China)

Abstract: The MAX phase is a layered ternary carbide and nitride with unique properties, in which doping with transition metals can be utilized to give it new properties using alloying while ensuring its intrinsic structure. In this study, the magnetic solid solution MAX phases V₂(Mn_xSn_1−x)C, V₂(Fe_xSn_1−x)C and V₂(Mn_xFe_xSn_1−2x)C were synthesized by pressureless sintering in V₂SnC doped with Mn and Fe atoms and pressureless sintering for 3 h at 1000 ℃. The maximum saturation was reached when the total doping amount was 0.4, while purity of the product decreased with the addition of solid solution elements. SEM-EDS results showed that the doping did not change the original lamellar morphology. The magnetic test results show that V₂(Mn_xSn_1−x)C(A = Mn/Fe) is a typical low-temperature ferromagnetic material. V₂(Mn_xSn_1−x)C has a wide hysteresis loop and is a typical hard magnetic material with a coercivity of 1428 Oe, while V₂(Fe_xSn_1−x)C shows lower coercive properties and is a soft magnetic material, and does not show ferromagnetism at x=0.2 and x=0.4, and the Curie temperature at x=0.6 is only 42 K. The magnetization curve of V₂(Mn_xFe_xSn_1−x)C shows a transition from ferromagnetism to paramagnetism at a Curie temperature of 61 K, and the hysteresis loop shows that it has a ferromagnetic property. The magnetization curve of V₂(Mn_xFe_xSn_1−x)C shows a transition from ferromagnetism to paramagnetism at a Curie temperature of 61 K. The hysteresis line shows that it has the properties of a soft magnetic material and the magnetic saturation strength reaches 3.80 emu·g⁻¹.
Key words: MAX phase; V₂SnC; doping; pressless sintering; magnetism