Naikun Sun
材料科学技术（英）
The (Co0.35Mn0.65)2P compound, prepared by a mechanical alloying plus solid sintering process, exhibits a second-order transition from a ferromagnetic state to a paramagnetic one at Curie temperature of about 320 K with no clear thermal hysteresis. A magnetic-entropy change (?SM) value above 1.6 J?kg-1?K-1 for a 5 T field change is obtained in the whole temperature range of 292.5-352.5 K and the maximum value of the (?SM is 2.3 ?kg-1?K-1 at 337.5 K. The study on the magnetocaloric effect of the (Co0.35Mn0.65)2P compound may be helpful for exploring good candidates for room-temperature magnetic refrigeration.
关键词:
Magnetocaloric
Naikun Sun
材料科学技术（英）
The (Co0.35Mn0.65)2P compound, prepared by a mechanical alloying plus solid sintering process, exhibits a second-order transition from a ferromagnetic state to a paramagnetic one at Curie temperature of about 320 K with no clear thermal hysteresis. A magnetic-entropy change (?SM) value above 1.6 J?kg-1?K-1 for a 5 T field change is obtained in the whole temperature range of 292.5-352.5 K and the maximum value of the (?SM is 2.3 ?kg-1?K-1 at 337.5 K. The study on the magnetocaloric effect of the (Co0.35Mn0.65)2P compound may be helpful for exploring good candidates for room-temperature magnetic refrigeration.
关键词:
Magnetocaloric
王冠伟
,
曹义明
,
袁淑娟
,
冯振杰
,
康保娟
,
鲁波
,
曹世勋
,
张金仓
低温物理学报
本文采用光学浮区法生长了HoFe0.95Mn0.05O3单晶样品,对其磁性和磁热效应进行了研究.研究表明,微量Mn的掺杂使HoFeO3的自旋重取向温度由58 K升高到102 K.磁化强度随温度变化和自旋重取向相变过程中的热滞现象共同说明,自旋重取向由原来HoFeO3中的Γ4(G,Fz)→Γ2(Gz,Fx)自旋重取向变为HoFe0.95 Mn0.05O3中的Γ4(G,Fx)→Γ1(Cx,Ax)的自旋重取向.磁熵计算表明,虽然在a轴方向得到了-16.7J/kg·K的磁熵变,HoFe0.95Mn0.05O3的磁熵变显示出明显的各向异性,但是微量Mn的掺杂并未对HoFeO3的磁熵造成明显的影响.
关键词:
HoFe0.95Mn0.05O3
,
单晶
,
自旋重取向
,
磁热效应
