“…For 12 kOe, the value of ΔT max is found to be about 2.5, 1.0, and 0.8 K that takes place at T=259, 288, and 300 K for x=0, 0.05, and 0.1, respectively. These values are significantly higher than those reported for some Adoped manganites if compared in the same field change [14,16]. However, in comparing with Gd metal [27], these values are modest, but with advanced features such as easy to prepare, controllable T C , high chemical stability, low-cost, wide magnetic phase transition region, and high RCP value, La 0.7−x Na x Ca 0.3 MnO 3 compounds should be considered as a potential candidate for the Ericsoncycle magnetic refrigerator near the RT region.…”