Gd-Sm (Gadolinium-Samarium)

Abstract

The Gd-Sm phase diagram in [Massalski2] was redrawn from [1983Gsc]. The two two-phase fields, L + (bGd, cSm) and (bGd, cSm) + (aGd, bSm), are so narrow that they were shown with straight lines. The (aSm) phase field was drawn vertically at (0°C, 60 at.% Sm) and smoothly connected to the bSm/aSm transition temperature (734°C) at 100 at.% Sm. This is based on the literature data that the maximum solubility of Gd in (aSm) is 40 at.%. Figure 1 shows the Gd-Sm phase diagram calculated by [2010Guo]. The narrow two-phase fields shown by [1983Gsc] could be reproduced, but the shape of the (aSm) phase field appeared differently. The shape shown in Fig. 1 is preferred because it is based on thermodynamics. Because there are no reliable experimental data, the trend of the (aSm) phase boundary is still tentative.