文献类型：期刊文献

英文题名：Preparation and magnetic properties of nanosized (La_0.47Gd_0.2) Sr_0.33MnO₃

作者：Wang, G; Wang, ZD; Zhang, LD

机构：[1]Zhanjiang Ocean Univ, Coll Engn, Zhanjiang 524088, Peoples R China;[2]Chinese Acad Sci, Inst Solid State Phys, Hefei 230031, Peoples R China

年份：2005

卷号：15

期号：3

起止页码：542

外文期刊名：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA

收录：SCI-EXPANDED(收录号：WOS:000230449600012)、、WOS

语种：英文

外文关键词：chemical synthesis; nanostructure materials; magnetocaloric effect; magnetic entropy change; perovskite manganite

外文摘要：Nanosized (La0.47Gd0.2)Sr0.33MnO3 perovskite oxides were prepared at relatively low calcinating temperature of 600 degrees C and 800 degrees C for 10 h using amorphous complex precursor. Curie temperature (T-c) 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 - 50 nm and 80 - 100 nm, and the T-c are 285.1 K and 285, 9 K, NICE are about 2. 02 J/(kg center dot K-1) and 3. 90 J/(kg center dot K-1) at 5 T magnetic field. A relatively large NICE with a broad peak around Curie temperature is observed in sample sintered at 800 degrees C for 10 h. This suggests that nanosized (La0.47Gd0.2)Sr0.33MnO3 is a suitable material as working substance in magnetic refrigeration in room temperature.