Fig. 8: Calculated formation enthalpies (eV per atom) of (RE1_0.25RE2_0.25Yb_0.25Lu_0.25)₂Si₂O₇.

The red, orange, purple, and green dashed circles point out the (Dy_0.25Y_0.25Yb_0.25Lu_0.25)₂Si₂O₇, (Tb_0.25RE2_0.25Yb_0.25Lu_0.25)₂Si₂O₇, (Gd_0.25RE2_0.25Yb_0.25Lu_0.25)₂Si₂O₇ and (Eu_0.25RE2_0.25Yb_0.25Lu_0.25)₂Si₂O₇ classification, respectively.