Magnetocaloric and magnetic properties of SmFe 0.5 Mn 0.5 O 3 complex perovskite
Magnetocaloric and magnetic properties of SmFe 0.5 Mn 0.5 O 3 complex perovskite
复制标题
DOI：
10.1016/j.jmmm.2015.10.076
复制
发表时间：
2016-03
影响因子：
2.7
通讯作者：
M. C. Silva-Santana;C. daSilva;P. Barrozo;E. Plaza;L. Valladares;N. O. Moreno
中科院分区：
文献类型：
--
作者：
M. C. Silva-Santana;C. daSilva;P. Barrozo;E. Plaza;L. Valladares;N. O. Moreno
本文研究了用燃烧反应法合成的SmFe0.5Mn0.5O3复合钙钛矿样品的物理性能。X-射线粉末衍射分析表明，合成产物为单相钙钛矿结构，具有正交相结构。低磁场测量表明，在234 K的自旋重取向相关的显着转变。磁热效应在18 K和234 K出现两个与磁行为变化有关的峰。在234 K附近的相变呈现逆磁热效应。磁热效应引起的熵变与外加磁场呈幂律关系，最大熵变为5.6 J/kg K，场变为70 kOe。从Δ S与H的关系中提取的临界指数在反铁磁到弱铁磁转变温度附近呈现显著的尖峰。
In this paper, we have investigated the physical properties of SmFe 0.5 Mn 0.5 O 3 complex perovskite samples, synthesized by means of combustion reaction method. X-ray powder diffraction indicates the formation of single phase perovskite with orthorhombic structure. Low magnetic field measurements show remarkable transition at 234 K related to spin reorientation. The magnetocaloric effect shows two peaks related to magnetic behavior changes, at 18 K and at 234 K. The transition about 234 K presents inverse magnetocaloric effect. The entropy variation from magnetocaloric effect shows power law as function of applied magnetic field with maximum entropy change 5.6 J/kg K with field variation of 70 kOe. Critical exponents extracted from Δ S vs. H presents a remarkable sharp peak near antiferromagnetic to weak ferromagnetic transition temperature.