Laves相稀土-过渡族金属间化合物Tb_(1-x)Dy_(x)Co_(1.95)的磁学性质及相变研究

Study on Magnetic Properties and the Nature of Phase Transition of Laves Phase Rare Earth-Transition Metal Compounds Tb_(1-x)Dy_(x)Co_(1.95)

主要研究了Tb_(1-x)Dy_(x)Co_(1.95)稀土-过渡族金属间化合物体系的磁学性质及相变性质。利用X射线衍射表征物相,利用磁学测量系统对材料的磁学性能及磁性相变的种类和温度进行测定,利用热机械分析仪(TMA)测试得到了材料的热膨胀曲线。结果表明:随着体系中Dy元素含量的增加,材料的晶格常数和居里温度均呈现降低趋势。Tb_(1-x)Dy_(x)Co_(1.95)体系在测试温度范围内发生了一级的铁磁相变,这弥补了相关领域的研究空白。除此之外,Tb1-xDyxCo1.95体系在发生磁性相变时的能量变化补偿了正常热胀冷缩,导致Tb_(1-x)Dy_(x)Co_(1.95)体系在一定温度范围内存在较小的热膨胀效应。

The magnetic properties and the nature of phase transition properties of Tb_(1-x)Dy_(x)Co_(1.95)was studied in this work,which was belong to the rare earth-transition intermetallic compounds system.The structure of compounds was test by the X-ray diffractometer.The magnetic properties and the types and temperatures of magnetic phase transitions were measured by the magnetic property measurement system,and the thermal expansion curves were test by the thermomechanical analyzer.The results show that the lattice constant and Curie temperature of the material tend to decrease with the increase of the content of Dy element in the system.The first-order phase transition properties of compounds can be derived from more in-depth data analysis,which fills the research gap in related fields.In addition,the energy change of the Tb_(1-x)Dy_(x)Co_(1.95)system when the magnetic phase transition occurred compensated for the normal thermal expansion and contraction,which resulted in a small thermal expansion effect in the Tb_(1-x)Dy_(x)Co_(1.95)system within a certain temperature range.