| Magnetic properties and magnetocaloric effects of Mn5Ge3-xGax |
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| 作者姓名： | 刘喜斌 张绍英 沈保根 刘喜斌 张绍英 沈保根 |
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| 作者单位： | [1]ChinesePeople'sArmedPoliceForceAcademy,Langfang065000,China [2]StateKeyLaboratoryforMagnetism,InstituteofPhysicsandCenterforCondensedMatterPhysics,ChineseAcademyofSciences,Beijing100080,China |
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| 摘 要： | We report on the magnetic properties and magnetocaloric effects of Mn5Ge3-xGax compounds with x=0.1,0.2,0.3,0.4,0.6 and 0.9. All samples crystallize in the hexagonal Mn5Si3-type structure with space group P63/mcm and order ferromagnetically.The Curie temperature of these compounds decreases with increasing x, from 306K (x=0.1) to 274K (x=0.9).The average Mn magnetic moments increases with increasing Ga content,reaching a maximum value at x=0.6.The magnetic entropy changes in these compounds are determined from the temperature and field dependence of the magnetization using the thermodynamic Maxwell relation.The Ga substitution has two kinds of influence on the magnetocaloric effect (MCE) of Mn5Ge3.One is that the magnitude of the magnetic entropy change decreases,the other is that the MCE peak becomes broadened.
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| 关 键 词： | 磁热效应 磁性质 磁熵转变 X射线衍射分析 磁学 居里温度 |
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