The Nb-U phase diagram in [Massalski2] was drawn based on [1958Rog] with modification from (γU) → (Nb) + (αU) reaction to (γU) → (Nb) + (βU) reaction according to [1982Ter].

This system was evaluated by [1995Koi]. Based with more experimental data, the change made in [Massalski2] was not adopted in the diagram of [1995Koi].

Figure 1 shows the Nb-U phase diagram obtained by [2008Liu] by thermodynamic modeling taking into account the phase diagram of [1995Koi].

Fig. 1
figure 1

Nb-U phase diagram