Synthesis of Different-Sized La0.7Sr0.3MnO3 Nanoparticles via a Polyacrylamide Gel Route and Their Magnetocaloric Properties

被引:3
作者
Wang, Y. F. [1 ,2 ]
Yang, H. [1 ,2 ]
机构
[1] Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China
[2] Lanzhou Univ Technol, Sch Sci, Lanzhou 730050, Peoples R China
基金
中国国家自然科学基金;
关键词
La0.7Sr0.3MnO3; Nanoparticles; Polyacrylamide gel route; Chelating agents; Magnetocaloric effect; MANGANITES; MAGNETORESISTANCE; REFRIGERATION; STATE;
D O I
10.1007/s10948-013-2190-8
中图分类号
O59 [应用物理学];
学科分类号
摘要
In this work, a polyacrylamide gel route was used to synthesize La0.7Sr0.3MnO3 nanoparticles. It is shown that single-phase La0.7Sr0.3MnO3 nanoparticles with a rhombohedral perovskite structure can be prepared at a calcination temperature of 600 A degrees C when separately using citric acid, tartaric acid, acetic acid, oxalic acid, and EDTA as the chelating agent. The particles prepared using the five chelating agents are nearly spherical in shape with a narrow diameter distribution, and have an average size of 24, 28, 36, 38, and 50 nm, respectively. Magnetic properties of the 24 and 50 nm samples (termed as samples S1 and S5, respectively) were investigated. It is revealed that the samples have a similar ferromagnetic Curie temperature T (C) , and exhibit a typical second-order magnetic phase transition near T (C) . The maximum magnetic entropy change at an applied magnetic field of 15 kOe is obtained to be about 0.71 and 0.74 J kg(-1) K-1 for the 24 and 50 nm samples, respectively.
引用
收藏
页码:3463 / 3467
页数:5
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