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Home > Issues > SearchThe Effect of Mn/Al Substitution on the Structural Stability and Magnetic Properties of Mn3AlC
Journal of Magnetics, Volume 24, Number 1, 31 Mar 2019, Pages 123-127
Xin-You Wang (College of Materials Science and Engineering, China Jiliang University), Ping-Zhan Si * 
(College of Materials Science and Engineering, China Jiliang University), Hui-Dong Qian (Powders and Ceramics Division, Korea Institute of Materials Science), Yang Yang (Powders and Ceramics Division, Korea Institute of Materials Science), Hong-Liang Ge (College of Materials Science and Engineering, China Jiliang University), Jihoon Park (Powders and Ceramics Division, Korea Institute of Materials Science), Xin-Qing Wang (College of Materials Science and Engineering, China Jiliang University), Chul-Jin Choi * (Powders and Ceramics Division, Korea Institute of Materials Science)
(College of Materials Science and Engineering, China Jiliang University), Hui-Dong Qian (Powders and Ceramics Division, Korea Institute of Materials Science), Yang Yang (Powders and Ceramics Division, Korea Institute of Materials Science), Hong-Liang Ge (College of Materials Science and Engineering, China Jiliang University), Jihoon Park (Powders and Ceramics Division, Korea Institute of Materials Science), Xin-Qing Wang (College of Materials Science and Engineering, China Jiliang University), Chul-Jin Choi * (Powders and Ceramics Division, Korea Institute of Materials Science)
Abstract
The structural stability and magnetic properties of Mn3+xAl1-xC antiperovskite with varied Mn/Al substitution were studied systematically. Single phase Mn3+xAl1-xC alloys with antiperovskite structure were obtained in
samples with x = −1/4, 0, 1/4, 1/2. An additional Mn23C6 phase was precipitated from Mn3+xAl1-xC antiperovskite for x = 3/4 while Mn23C6 phase was formed as major phase for x = 1. The mutual substitution of Mn and Al atoms has substantial effect on the Curie temperature and the saturation magnetization of the Mn3+xAl1-xC alloys. In comparison with the as-cast alloys, the as-annealed Mn3+xAl1-xC alloys exhibit reduced Mn/Al
substitutions after high temperature homogenization, which enhances the ordering of Mn and Al atoms in the lattices. The Curie temperature of the homogenized Mn3+xAl1-xC increases with increasing Mn substitution to
Al. The Mn3AlC alloy shows the highest saturation magnetization among all samples with varied Mn/Al ratios. Most samples show zero coercivity and zero remanent magnetization. The maximum value of the magnetic
entropy changes of Mn2.75Al1.25C at 285 K is 2.26 J/kg K in fields up to 3 T.
samples with x = −1/4, 0, 1/4, 1/2. An additional Mn23C6 phase was precipitated from Mn3+xAl1-xC antiperovskite for x = 3/4 while Mn23C6 phase was formed as major phase for x = 1. The mutual substitution of Mn and Al atoms has substantial effect on the Curie temperature and the saturation magnetization of the Mn3+xAl1-xC alloys. In comparison with the as-cast alloys, the as-annealed Mn3+xAl1-xC alloys exhibit reduced Mn/Al
substitutions after high temperature homogenization, which enhances the ordering of Mn and Al atoms in the lattices. The Curie temperature of the homogenized Mn3+xAl1-xC increases with increasing Mn substitution to
Al. The Mn3AlC alloy shows the highest saturation magnetization among all samples with varied Mn/Al ratios. Most samples show zero coercivity and zero remanent magnetization. The maximum value of the magnetic
entropy changes of Mn2.75Al1.25C at 285 K is 2.26 J/kg K in fields up to 3 T.
Keywords: Mn3AlC; Mn4C; magnetic properties; substitution; magnetocaloric effect
DOI: https://doi.org/10.4283/JMAG.2019.24.1.123
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