Phase Relationship of the CeCo5-SmCo5 Pseudobinary System

The phase relationships of the CeCo5-SmCo5 pseudobinary system have been studied by means x-ray powder diffraction (XRD), differential thermal analysis (DTA), thermogravimetric measurements (TGM), and scanning electron microscopy equipped with energy dispersive spectroscopy (SEM–EDS). XRD results show that continuous solid solutions were formed in this system, all (Ce, Sm)Co5 belong to a hexagonal structure space group P6/mmm. With increase Sm content x, lattice parameter, a, cell volume, V, (Ce1−xSmx)Co5 linearly, but its c, decreases linearly. DTA temperature peritectic reaction L + Sm)2Co17 → Sm)Co5, liquid transition Sm)2Co17, Curie alloys almost linearly as x increases from 0 1.0. Based on data, tentative vertical section diagram has constructed.