(a) Initial magnetization curves measured at 295 K. The inset is an enlarged view of the high-field regime. The M–T and d M / d T –T curves in the temperature ranges of (b) 380–670 K and (c) 25–200 K for [(Pr, Nd)_1−x(La, Ce)_x]_2.14Fe₁₄B (x = 0–0.5) samples. (d) The derived saturation magnetization M_s, Curie temperature T_C, and spin reorientation temperature T_SR as a function of La–Ce content x.^[23]