Structural and magnetocaloric effect of Ln0.67Sr0.33MnO3 (Ln=La, Pr and Nd) nanoparticles
Structural and magnetocaloric effect of Ln0.67Sr0.33MnO3 (Ln=La, Pr and Nd) nanoparticles
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DOI：
10.1016/j.ceramint.2014.07.154
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发表时间：
2014-12
影响因子：
5.2
通讯作者：
G. Wang;L. R. Li;Z. R. Zhao;X. Yu;X. Zhang
中科院分区：
文献类型：
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作者：
G. Wang;L. R. Li;Z. R. Zhao;X. Yu;X. Zhang
采用溶胶-凝胶法制备了Ln 0. 67 Sr 0. 33 MnO 3（Ln=La，Pr和Nd）纳米粒子。详细研究了样品的结构和磁性。X射线衍射（XRD）分析表明，La掺杂样品以菱方钙钛矿结构结晶，Pr掺杂和Nd掺杂样品主要由斜方钙钛矿结构相组成。与掺La样品相比，Pr和Nd的掺杂降低了样品的居里温度和饱和磁化强度，并使相变变宽。所有样品在较宽的温度范围内都表现出明显的磁热效应。在0 ~ 5 T磁场变化下，Ln=La、Pr和Nd的样品的最大等温熵变分别为2.49、1.94和0.93J/kg K，相应的相对冷却功率分别为225、265和246 J/kg。结果表明，这些纳米颗粒可以用于在宽的温度范围内的磁制冷。
The Ln0.67Sr0.33MnO3(Ln=La, Pr and Nd) nanoparticles were prepared by using the sol–gel method. The structural and magnetic properties of the samples were investigated in detail. The X-ray diffraction (XRD) analyses indicate that the La-doped sample crystalizes in rhombohedral perovskite structure and the Pr-doped and Nd-doped samples are mainly composed of orthorhombic perovskite structure phase. The Curie temperature and saturation magnetization are lowered and the phase transition is broadened by the Pr and Nd substitutions when comparing with the La-doped sample. All the samples exhibit significant magnetocaloric effects in a wide temperature range. Under a field change from 0 to 5 T, the maximum values of isothermal entropy change are found to be 2.49, 1.94 and 0.93 J/kg K for the samples with Ln=La, Pr and Nd, respectively, and the corresponding values of relative cooling power reach 225, 265 and 246 J/kg. The results suggest that those nanoparticles could be useful for magnetic refrigeration in a broad temperature range.