ABSTRACT
The M g - G d phase diagram for the full concentration range is shown in Figure 24. It has
been redrawn following mainly the last evaluated version [144] which has taken into
account investigations [99, 148, 166]. Meanwhile, the Mg-r i ch part of the phase diagram
[144] was to an extent corrected according to the last investigation of the Ba ikov Institute
of Metallurgy [108]. The phase diagram shows the existence of four binary compounds,
M g 5 G d , M g 3 G d , M g 2 G d and M g G d . A l l of them are peritectically formed. There is one
eutectic equilibrium on the M g side, and one eutectoid equilibrium connected with two
allotropic forms of gadolinium. The crystal structure of the binary compounds are
described in Table 15. Unl ike other M g - R E compounds, the formula M g 5 G d shows the
Table 15. Crystal structure of the M g - G d binary compounds.
