Experimental investigation of the phase equilibria in Co–Fe-Sm system with special attention to the effect of Fe substitution in structure and magnetic properties of intermetallic phases

Phase Relationship of the CeCo5-SmCo5 Pseudobinary System

“…The first endothermic peak is observed at the temperatures of 1191°C, 1204°C, 1207°C, 1219°C, 1229°C, 1237°C, 1247°C, 1259°C, 1271°C, 1283°C, and 1292°C for x = 0.0-1.0, respectively. According to the conclusions reported in the literature, 16,18,19 the phase transition of 1191-1292°C for x = 0.0-1.0 is determined to the peritectic reaction, L + (Ce, Sm) 2 Co 17 fi (Ce, Sm)Co 5 . Here, the peritectic reaction temperature of the CeCo 5 and SmCo 5 phases are close to the values reported in the literature, 17,19 i.e., 1194°C and 1292°C for the CeCo 5 and SmCo 5 phases, respectively.…”

“…16,17 With the temperature reduced, the phase SmCo 5 should not exist in equilibrium state below 880°C, because the SmCo 5 phase decomposes into Sm2Co17 and Sm5Co19 phases by the eutectoid decomposition reaction SmCo5 fi Sm2Co17 + Sm5Co19 at about 880°C. 18 As for the CeCo5 phase, it is also formed by the peritectic reaction L + Ce 2 Co 17 fi CeCo 5 at about 1194°C, while the Ce 2 Co 17 phase is formed by the peritectic reaction L + a-Co fi Ce 2 Co 17 at about 1211°C. 19 At about 750°C, the eutectoid decomposition reaction CeCo 5 fi Ce 2 Co 17 + Ce 5 Co 19 occurs, and the phase CeCo 5 decomposes into Ce 2 Co 17 and Ce 5 Co 19 phases.…”