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The effects of Tb doping on the negative and positive magnetocaloric effects of Mn3Ga1−xTbxC (0.02 ≤ x ≤ 0.05)

Wang Yi,Yan Jun,Chen Yunlin,Cui Qiuhong

Generally, researchers focus on the great negative magnetocaloric effect (NMCE) rather than the positive magnetocaloric effect (PMCE) in Mn 3 GaC. Here, we prepared Mn 3 Ga 1−x Tb x C composites with a partial substitution of Ga by Tb. Tb doping expands the canted-ferromagnetic phase (CFM) between the anti-ferromagnetic and ferromagnetic phase in Mn 3 Ga 0.97 Tb 0.03 C. The CFM phase can be as a boundary to separate the NMCE from PMCE. It is possible to combine the NMCE and PMCE for refrigeration. Compared with NMCE in Mn 3 GaC, NMCE–PMCE combination in Mn 3 Ga 0.97 Tb 0.03 C displays a much larger operating temperature range without loss of magnetic entropy changes. Therefore, the NMCE–PMCE combination is valuable for improving the operating temperature range of magnetocaloric effect materials. It also provides a new idea for refrigeration applications.