Abstract :
The novel RCo5Ga7 (R=Y, Tb, Dy, Ho and Er) intermetallic compounds have been synthesized, and their crystallographic and magnetic properties have been studied using X-ray diffraction and magnetic measurement. RCo5Ga7 crystallizes in an orthorhombic structure with ScFe6Ga6 type. The space group is Immm, and Z=2. According to the structural refinement result, the 2a, 4e, 4f, 4g, 4h, and 8k crystal positions are occupied by 2R, 4GaI, 4(GaII, CoI), 4GaIII, 4(GaIV,CoII), and 8(CoIII,GaV), respectively. The RCo5Ga7 intermetallic compound can be stabilized in the range of the radius ratio of RRe/R(Co,Ga)<1.36. The RCo5Ga7 compound exhibits a paramagnetic behavior. The magnetization at 5 K ranges from 28.93 to 40.62 emu/g.
