Extended Data Fig. 8: Temperature dependent measurements on R2ReN4 and R2ReN3.

Temperature-evolution of lattice parameters, volume, phase fraction (p.f.), as well as differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) for Pr2ReN4 (left, black) and Nd2ReN4 (right, black). Lattice parameters of the R2ReN3 phases are displayed as orange diamonds.