Structure and magnetic properties of ScFe6Ga6-type RCo5Ga7 (R=Y, Tb, Dy, Ho and Er)
作者:Hong Chang、Yong-quan Guo、Lin-tao Yang、Quan-lin Liu、Wei-cun Feng、Jing-kui Liang、Guang-hui Rao
DOI:10.1016/j.jssc.2004.07.040
日期:2004.11
RCo5Ga7 (Immm), R occupies the 2a site, and Co enters into the 8k and the 4h sites, and Ga is at the 4e, 4f, 4g, 4h and 8k sites. The interatomic distances and the coordination numbers of RCo5Ga7 are provided from the refinement results. The short interatomic distance (less than 2.480 Å) between the Co ions results in the negative magnetic interaction, which does not favor ferromagnetic ordering. The
所述的结构和磁特性ř有限公司5镓7([R = Y,Tb时,Dy,Ho及Er)的与所述SCFE化合物6嘎6型结构进行了研究。的稳定性ř有限公司5镓7与金属半径R的比密切相关的RE / R (CO,Ga)的RRE / R(CO,Ga)的。其中R RE / R (CO,Ga)的⩽1.36RRE/ R(CO,Ga)的⩽1.36 ,所述化合物可以在SCFE稳定6镓6型结构。的晶格ř有限公司5嘎7个收缩为一体的原子有序- [R增加,并且它与镧系收缩相一致。基于X射线衍射图案之外的结构分析揭示了在具有斜方晶系ř有限公司5镓7(IMMM),- [R占据2一个部位,和Co进入8 ķ和4个ħ位点,和Ga是在4- ê,4 ˚F,4克,4 ħ和8个ķ位点。的原子间距离和配位数ř有限公司5镓7从细化结果提供。的Co离子结果之间的短原子间距离(小于2.480 a)在负磁相互作用,这不利于铁磁有序。YCO的磁矩5嘎7是不存在,且-