| Dy3NiSi2合金磁相变与磁热性能研究 |
| |
| 引用本文： | 陈湘,陈云贵,唐永柏.Dy3NiSi2合金磁相变与磁热性能研究[J].中国稀土学报,2020(2):169-175. |
| |
| 作者姓名： | 陈湘 陈云贵 唐永柏 |
| |
| 作者单位： | 内江师范学院物理与电子信息工程学院;四川大学材料科学与工程学院 |
| |
| 基金项目： | 四川省科技厅科研项目(2017JY0181)资助。 |
| |
| 摘 要： | 通过对Dy3NiSi2合金样品的X射线粉末衍射谱、等温变磁磁化曲线、等磁场变温磁化曲线分析,主要研究了合金的相结构和晶格参数、磁相变属性和磁热性能。X射线衍射谱表明Dy3NiSi2样品几乎为Gd3NiSi2型正交结构(空间群:Pnma,No.62)的单相合金,其晶格常数分别为a=1.1242(3)nm,b=0.41073(3)nm,c=1.1223(9)nm。在45~300 K温度范围内,Dy3NiSi2合金仅展现出铁磁-顺磁相变,0.01 T磁场下的dM/dT和0~2 T磁场下的Arrott图表明,Dy3NiSi2合金的磁相变为居里温度Tc=54 K的铁磁-顺磁二级磁相变。在0~2 T磁场范围内,Dy3NiSi2合金居里温度处的最大磁熵变为3.65 J·(kg·K)^-1,相对制冷量为167.9 J·kg^-1。
|
| 关 键 词： | RE3Ni2Si2合金 磁相变 磁热效应 |
Magnetic Transition and Magnetocaloric Effect of Dy3NiSi2 Alloy |
| |
| Chen Xiang,Chen Yungui,Tang Yongbo.Magnetic Transition and Magnetocaloric Effect of Dy3NiSi2 Alloy[J].Journal of the Chinese Rare Earth Society,2020(2):169-175. |
| |
| Authors: | Chen Xiang Chen Yungui Tang Yongbo |
| |
| Institution: | (Department of Physics and Electronic Informational Engineering,Neijiang Teachers College,Neijiang 641112,China;School of Materials Science and Engineering,Sichuan University,Chengdu 610065,China) |
| |
| Abstract: | Structural,magnetic and magnetocaloric properties of Dy3NiSi2 were investigated using x-ray powder diffraction,magnetic susceptibility and magnetization measurements.X-ray powder diffraction pattern shows that Dy3NiSi2 crystallizes in the Gd3NiSi2-type orthorhombic structure(space group:Pnma,No.62,a=1.1242(3)nm,b=0.41073(3)nm,c=1.1223(9)nm).In the temperature range from 35 to 240 K,this compound only exhibits ferromagnetism with the second order ferromagnetic-paramagnetic transition at TC=54 K confirmed by dM/dT data in a field of 0.1 T and Arrott plots in a field change of 0~2 T,respectively.The maximum value of the magnetic entropy change determined from M(H)data is-3.65 J·(kg·K)^-1 near TC for a field change ofΔH=20 kOe. |
| |
| Keywords: | Dy3NiSi2 alloy magnetic transition magnetocaloric effect |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
