Synthesis and magnetocaloric properties of La0.7Ca0.3MnO3 nanoparticles with different sizes

Synthesis and magnetocaloric properties of La0.7Ca0.3MnO3 nanoparticles with different sizes
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不同尺寸La0.7Ca0.3MnO3纳米粒子的合成及磁热性能

DOI:
10.1016/j.jallcom.2012.11.200
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发表时间:
2013-04
影响因子:
6.2
通讯作者:
朱彦虎(研究生)
朱彦虎(研究生)
中科院分区:
材料科学2区
文献类型:
--
作者:
杨华;朱彦虎(研究生)

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采用聚丙烯酰胺凝胶法制备了具有不同平均粒径的la0.7 ca0.3 mno3纳米粒子,并通过使用不同的螯合剂调整了纳米粒子的粒径。用螯合剂乙酸(S1)、草酸(S2)、柠檬酸(S3)和EDTA (S4)制备的样品平均粒径分别为30、37、45和50nm。所制备的颗粒呈规则的球形。对粒径最小和粒径最大的样品S1和S4的磁热特性进行了系统的研究。样品S1的顺磁-铁磁转变温度为260K,样品S4为267K。磁相变的性质确定为二阶。发现磁熵变化在TC附近的温度范围很广,样品S1和S4在外加磁场为15kOe时的最大值分别为1.01和1.20Jkg−1K−1。
La0.7Ca0.3MnO3nanoparticles with different average sizes were prepared via a polyacrylamide gel route, where the particle size was tailored by using different chelating agents. The samples prepared by using the chelating agents acetic acid (S1), oxalic acid (S2), citric acid (S3) and EDTA (S4) have an average particle size of 30, 37, 45 and 50nm, respectively. The as-prepared particles are regularly shaped like spheres. Magnetocaloric properties of samples S1 and S4 that respectively have the smallest and largest particle size were systematically investigated. The paramagnetic–ferromagnetic transition temperature TCis observed to be 260K for sample S1 and 267K for sample S4. The nature of the magnetic phase transition at TCis determined to be second order. The magnetic entropy change is found to be extended over a wide range of temperature around TC, and its maximum value at an applied magnetic field of 15kOe is obtained to be 1.01 and 1.20Jkg−1K−1for samples S1 and S4, respectively.
DOI: 10.1088/0022-3727/43/13/135001
发表时间: 2010-04
期刊: Journal of Physics D: Applied Physics
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影响因子: 2.5
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粒度对 La0.7Ca0.3MnO3 的影响:尺寸引起的磁相变顺序变化和磁热研究
DOI: 10.1016/j.jmmm.2010.02.038
发表时间: 2010-08-01
影响因子: 2.7
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DOI: 10.1063/1.3037236
发表时间: 2008-12
影响因子: 3.2
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DOI: 10.1016/0031-9163(64)91158-8
发表时间: 1964-01-01
期刊: PHYSICS LETTERS
影响因子: --
作者:
BANERJEE, SK
通讯作者: BANERJEE, SK