Gd2(Co,Al)17化合物的结构和磁晶各向异性

稀有金属材料与工程, 2005, 34(1): 41-45.

Gd2(Co,Al)17化合物的结构和磁晶各向异性

顾正飞 ^1, , 刘正义 ^2, , 曾德长 ^3, , 梁思祖 ^4, , ^5, , ^6,

1.桂林电子工业学院,广西,桂林,541004;华南理工大学,广东,广州,510640;University of Amsterdam,Amsterdam,the Netherlands

2.华南理工大学,广东,广州,510640

3.华南理工大学,广东,广州,510640

4.华南理工大学,广东,广州,510640;University of Amsterdam,Amsterdam,the Netherlands

5.University of Amsterdam,Amsterdam,the Netherlands

6.University of Amsterdam,Amsterdam,the Netherlands

基金项目: 中-荷兰合作项目荷兰技术科学基金国家自然科学基金(50261002)

关键词： Gd2Co17-xAlx化合物 , 磁晶各向异性 , 择优占位

Structure and Magnetocrystalline Anisotropyp of Gd2Co17-xAlx Compounds

通过磁性测量和X-射线衍射研究了Gd2Co17-xAlx化合物的结构和磁晶各向异性.当x≤4时,样品具有菱方Th2Zn17型结构,x=5时,具有六方CaCu5型结构.随着Al浓度增加,晶格常数和单胞体积单调增大,而居里温度和自发磁化强度近似线性地减小;在x≥1时,观察到Co亚点阵的磁晶各向异性变号,室温易磁化方向由易面转变为易轴,且易轴各向异性场和各向异性常数随Al原子浓度增加出现极大值;基于补偿温度(65 K)下自由粉末颗粒的磁化曲线,导出了亚点阵间的分子场系数和Gd-Co交换耦合常数,结果表明,Al原子对Gd-Co交换耦合作用的影响较小.根据Al原子在Co亚点阵4种晶位的择优占位,分析了磁晶各向异性的演变.

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