La0.67Sr0.33MnO3锰氧化物的微波辅助水热合成及其磁热性能

Microwave assisted hydrothermal synthesis and magnetocaloric properties of La0.67Sr0.33MnO3 manganite.

作者信息

Anwar M S, Kumar Shalendra, Ahmed Faheem, Kim G W, Koo Bon Heun

机构信息

School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam, 641-773, Republic of Korea.

出版信息

J Nanosci Nanotechnol. 2012 Jul;12(7):5523-6. doi: 10.1166/jnn.2012.6327.

DOI:10.1166/jnn.2012.6327

PMID:22966603

Abstract

We report microwave assisted hydrothermal synthesis and magnetocaloric properties of La0.67Sr0.33MnO3 manganite. The synthesized La0.67Sr0.33MnO3 nanoparticles was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS) and magnetization measurements. The XRD results indicated that La0.67Sr0.33MnO3 nanoparticles have polycrystalline nature with monoclinic structure. FE-SEM results suggested that La0.67Sr0.33MnO3 nanoparticles are assembled into rod like morphology. Magnetization measurements show that La0.67Sr0.33MnO3 nanoparticles exhibit transition temperature (Tc) above room temperature. The maximum magnetic entropy change (deltaS(M))max was found to be 0.52 J/kg K near Tc approximately 325 K at applied magnetc field of 20 kOe. This compound may considered as potential material for magnetic refrigeration near room temperature.

摘要

我们报道了La0.67Sr0.33MnO3锰氧化物的微波辅助水热合成及其磁热性能。使用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、能量色散X射线光谱（EDS）和磁化测量对合成的La0.67Sr0.33MnO3纳米颗粒进行了表征。XRD结果表明，La0.67Sr0.33MnO3纳米颗粒具有单斜结构的多晶性质。FE-SEM结果表明，La0.67Sr0.33MnO3纳米颗粒组装成棒状形态。磁化测量表明，La0.67Sr0.33MnO3纳米颗粒在室温以上表现出转变温度（Tc）。在20 kOe的外加磁场下，在约325 K的Tc附近，最大磁熵变（deltaS(M)）max为0.52 J/kg K。该化合物可被视为室温附近磁制冷的潜在材料。