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Relative to Sm2Co7 plus Sm2Co17, SmCo5 is stable below 700 K and above 1000 K. Contrary to previous thinking, this is thermodynamically consistent. The free energies of formation of these phases seem to be marginal when estimated from data reported for the analogous compounds of other lanthanons. Above its Curie point at 713 K, Sm2Co7 is stabilized by its gain in entropy from magnetic disordering,...