fig2

Figure 2. Thermodynamic analysis for (A-C) RE₃TaO₇ and (D-F) RE₂Zr₂O₇ comparisons (RE = Sc, Y, La ~ Lu), including (A and D) Equilibrium energy, (B and E) equilibrium volume and (C and F) formation energies of different phases. Symbols denote space groups: C222₁, Cmcm and Fm$$ \bar{3} $$m for RE₃TaO₇; Fd$$ \bar{3} $$m and Fm$$ \bar{3} $$m for RE₂Zr₂O₇ oxides. RE: Rare-earth.