Nanosized (La0.47 Gd0.2)Sr0.33MnO3 perovskite oxides were prepared at relatively low calcinating temperature of 600℃ and 800℃ for 10h using amorphous complex precursor. Curie temperatureTc and magnetocaloric e...Nanosized (La0.47 Gd0.2)Sr0.33MnO3 perovskite oxides were prepared at relatively low calcinating temperature of 600℃ and 800℃ for 10h using amorphous complex precursor. Curie temperatureTc and magnetocaloric effects（MCE） were investigated. X-ray diffraction（XRD） and electron diffraction（ED） reveal that the resulting products are of pure single-phase rhombohedral perovskite structure. Transmission electron microscopy（TEM） observation finds that the particle sizes are about 40-50nm and 80-100nm, and the Tc are 285.1K and 285.9K, MCE are about 2.02J/（kg·K-1 ） and 3.90J/（kg·K-1 ） at 5T magnetic field. A relatively large MCE with a broad peak around Curie temperature is observed in sample sintered at 800℃ for 10h. This suggests that nanosized (La0.47 Gd0.2)Sr0.33MnO3 is a suitable material as working substance in magnetic refrigeration in room temperature.展开更多
文摘Nanosized (La0.47 Gd0.2)Sr0.33MnO3 perovskite oxides were prepared at relatively low calcinating temperature of 600℃ and 800℃ for 10h using amorphous complex precursor. Curie temperatureTc and magnetocaloric effects（MCE） were investigated. X-ray diffraction（XRD） and electron diffraction（ED） reveal that the resulting products are of pure single-phase rhombohedral perovskite structure. Transmission electron microscopy（TEM） observation finds that the particle sizes are about 40-50nm and 80-100nm, and the Tc are 285.1K and 285.9K, MCE are about 2.02J/（kg·K-1 ） and 3.90J/（kg·K-1 ） at 5T magnetic field. A relatively large MCE with a broad peak around Curie temperature is observed in sample sintered at 800℃ for 10h. This suggests that nanosized (La0.47 Gd0.2)Sr0.33MnO3 is a suitable material as working substance in magnetic refrigeration in room temperature.
