摘要
在中子三轴谱仪上用粉末中子衍射测定室温下Ｈｏ２Ｆｅ９Ｇａ２Ａｌ６和Ｈｏ２Ｆｅ９Ｇａ６Ａｌ２的晶体结构和磁结构，衍射数据用Ｉｚｕｍｉ的Ｒｉｅｔｖｅｌｄ分析程序ＲＩＥＴＡＮ进行轮廓精修处理，确定替代原子Ｇａ、Ａｌ的占位及占位数以及磁性原子Ｈｏ、Ｆｅ的原子磁矩的大小和方向。Ｈｏ２Ｆｅ９Ｇａ２Ａｌ６显顺磁性，Ｈｏ２Ｆｅ９Ｇａ６Ａｌ２显亚铁磁性，显单轴各向异性。并给出了居里温度和饱和磁化强度随Ｇａ、Ａｌ含量的变化关系。
The crytallographic and magnetic structure of Ho2Fe9Ga2Al6 and Ho2Fe9Ga6Al2 are studied bypowder neutron diffraction at room temperature. The atom fractional occupancies of Ga and Al andthe atom magnetic moments of Ho and Fe are obtained by Rietveld analysis program. The magnetic structure of Ho2Fe9Ga6Al2 shows an easy-axis anisotropy, with the Fe magnetic moments beingferrimagnetically coupled to those of Ho. The saturation magnetization and Curie temperatures ofsamples Ho2Fe9Ga8-x.Alx with x in the range 0-8 are determined.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1996年第6期529-534,共6页
Atomic Energy Science and Technology
基金
国家自然科学基金
核工业科学基金
关键词
中子衍射
晶体结构
磁结构
磁性材料
Neutron diffraction
Crystallographic structure
Magnetic structure
