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Structure and magnetic properties of ScFe6Ga6-type RCo5Ga7 (R=Y, Tb, Dy, Ho and Er) |
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| Authors: | Hong Chang Yong-quan Guo Quan-lin Liu Jing-kui Liang Guang-hui Rao |
| Institution: | a Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China b Institute of Semiconductors, Chinese Academy of Sciences, Qinghua donglu jia 35, Haidian District, Beijing 100083, China c Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China d International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China |
| Abstract: | The structure and magnetic properties of the RCo5Ga7 (R=Y, Tb, Dy, Ho and Er) compounds with the ScFe6Ga6-type structure have been studied. The stability of RCo5Ga7 is closely related with the ratio of the metal radii RRE/R(Co,Ga). With RRE/R(Co,Ga)?1.36, the compounds can be stabilized in the ScFe6Ga6-type structure. The lattice of RCo5Ga7 shrinks as the atomic order of R increases, and it is consistent with the lanthanide contraction. The structure analysis based on X-ray diffraction patterns reveals that in the orthorhombic 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 magnetic moment of YCo5Ga7 is absent, and RCo5Ga7 (R=Tb, Dy, Ho and Er) may have long-range magnetic ordering with the paramagnetic Curie temperature lower than 5 K. |
| Keywords: | 75 20 &minus g 75 30 Cr 61 10 Nz |
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