C2O42--Templated [Ln2Ni] Heterometallic Compounds for Enhanced Magnetocaloric Effect at Low-Field

Three new Ln2Ni (Ln = Gd, Sm, Tb) heterometallic compounds templated by C 2 O 4 2− anions were synthesized. The magnetic investigation showed that Gd2Ni displays an excellent low-field MCE (−Δ S m = 25.1 J kg −1 K −1 for 2.0 T at 2.0 K).