文献类型：期刊文献

英文题名：Magnetocaloric properties of (La0.67-xGdx)Sr0.33MnO3 polycrystalline nanoparticles

作者：Zhao, Juan[1]; Wang, Gui[1]

机构：[1] Engineering College, Guangdong Ocean University, Zhanjiang, 524088, China

年份：2009

卷号：321

期号：19

起止页码：2977

外文期刊名：Journal of Magnetism and Magnetic Materials

收录：EI(收录号：20092912198738)、Scopus(收录号：2-s2.0-67650118110)

语种：英文

外文关键词：Nanomagnetics - Curie temperature - Lanthanum compounds - Perovskite - Synthesis (chemical) - Magnetic refrigeration - Manganites

外文摘要：In this paper, magnetic property and magnetocaloric effect (MCE) in nanoparticles perovskite manganites of the type (La0.67-xGdx)Sr0.33MnO3 (x=0.10, 0.15, 0.20) synthesized by using an amorphous molecular alloy as precursor have been reported. From the magnetic measurements as function of temperature and magnetic applied field, we have discovered that the Curie temperature (TC) of the prepared samples is found to be strongly dependent on Gd content. The Curie temperature of samples is 358.4, 343.2, and 285.9 K for x=0.1, 0.15, and 0.2, respectively. A large magnetocaloric effect close to TC has been observed with a maximum of magnetoentropy change in all the samples, {divides}ΔSM{divides}max of 1.96 and 4.90 J/kg K at 2 and 5 T, respectively, for a substitution rate of 0.15. In addition, the maximum magnetic entropy change observed for samples with different concentration of Gd, exhibits a linear dependence with the applied high magnetic field. These results suggest that (La0.67-x Gdx)Sr0.33MnO3 (x=0.10, 0.15, 0.20) compounds could be a suitable candidate as working substance in magnetic refrigeration near room temperature. ? 2009.