【摘要】 对(Gd1-xDyx)5Si4(x=0.1,0.2,0.3,0.35)和(Gd1-xHox)5Si4(x=0.05,0.15,0.25)系列合金的居里温度、磁相变、磁熵变等磁性质进行了研究。结果发现:该系列合金保持了Gd5Si4的Sm5Ge4正交型晶体结构,居里温度随着引入的x量的增加而呈近似线性减小趋势;在居里温度附近样品的磁特性符合二级相变规律;通过调节Dy或Ho的含量调节居里点,样品中不含贵重元素Ge,大大降低了成本;在较宽的温度范围和低场下(<2T)具有较大的磁熵变值从而使其适合于被制成梯度功能复合材料。研究表明(Gd1-xREx)5Si4(RE=Dy,Ho)系列材料有望成为较好的室温低场磁制工质。更多还原

【Abstract】 The magnetic properties, including Curie points, magnetic phases transition and magnetic entropy changes, of (Gd_1-xRE_x)₅Si₄（RE=Dy, Ho） alloys were systematically studied. The results show that the alloys keep the Sm₅Ge₄ orthorhombic structures as Gd₅Si₄, and the Curie points of the alloys almost linearly decrease with increasing content of x, so that the Curie points can be adjusted by adding different concentrations of Dy or Ho in the alloys. The magnetic properties of these alloys obey second order transition. The costs of these alloys are cheaper than that of Gd-Si-Ge alloys because there is not expensive element such as Ge. The large magnetic entropy change at low fields （<2 T） and wide temperature ranges of these alloys suggest that they are suitable to be the gradient function materials and candidates of magnetic refrigerants at room temperature with low fields.更多还原