Magnetic and structural properties of SmCo6.75−xFexZr0.25 compounds
Magnetic and structural properties of SmCo6.75−xFexZr0.25 compounds
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DOI：
10.1016/s0925-8388(99)00660-x
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发表时间：
2000-02
影响因子：
6.2
通讯作者：
I. Al-Omari;Jian Zhou;D. Sellmyer
中科院分区：
文献类型：
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作者：
I. Al-Omari;Jian Zhou;D. Sellmyer
SmCo6.75−xFexZr0.25（x=0、0.27、0.41和0.54）块体合金通过电弧熔炼制备。用X射线衍射仪、振动样品磁强计和SQUID磁强计对合金进行了表征。X射线衍射表明，当x<0.67时，这些化合物形成六方TbCu_（7）型结构，当x≥0.67时，不能形成六方TbCu_（7）型结构。晶格参数（a和c）取决于铁浓度。发现晶胞体积随着x的增加而增加，这是由于Fe的原子体积较大。对磁排列样品的X射线衍射和磁化强度测量表明，所研究的所有样品都具有单轴各向异性。在室温和5K下，饱和磁化强度均随x的增加而增加.对于所研究的所有x值，这些化合物的居里温度约为770°C。
Bulk alloys of SmCo6.75−xFexZr0.25, where x=0, 0.27, 0.41, and 0.54 were prepared by arc-melting. The alloys were characterized by X-ray diffraction, vibrating sample magnetometer, and SQUID magnetometer. X-ray diffraction shows that these compounds form the hexagonal TbCu7-type structure for x<0.67 and for large values of x (x≥0.67) the hexagonal TbCu7-type structure cannot be formed. The lattice parameters (a and c) are dependent on the iron concentration. The unit cell volume is found to increase with x which is due to the larger atomic volume of Fe. X-ray diffraction and magnetization measurements on magnetically aligned samples show that all the samples studied have uniaxial anisotropy. The saturation magnetization increases with x at both room temperature and 5 K. The Curie temperature for these compounds is about 770°C for all values of x under investigation.