โ Scribed by J.F Smith; D.M Bailey; D.B Novotny; J.E Davison
No coin nor oath required. For personal study only.
Three intermediate phases occur in the yttrium-magnesium system. The y-phase is isostruoturel with C&l snd has & range of homogeneity of .-2 t&o/J. is essentially invariant in stoichiometry. The &phase is isostructural with MgZn, and The e-phase crystallizes with the a-manganese structure and a limiting stoiehiomet~ of Y,Mgza at the per&e&c temperature; at temperatures below the peritectio decomp~ition the stoichiometry is more m~esium-rich with 8 rsnge of homogeneity of N 3 at.%. The free energies of phase formation have been determined from measurement of magnesium vapor pressures over a series of alloys while the enthalpies of phese formation have been determined calori-metrieJly with a differential acid solution calorimeter. Combination of the data yield the following values for the thermodynamic functions associated with phase formation respectively of YMg, YMg,
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