Liang C Y, Che R C, Yang H X, Li J Q
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
J Nanosci Nanotechnol. 2008 Jul;8(7):3577-81. doi: 10.1166/jnn.2008.160.
Multi-crystalline La0.5Ba0.5MnO3 Nanowires have been synthesized with cationic surfactant at 220 degrees C. The structure, composition and physical property of the as-prepared nanowires have been characterized by a series of techniques including XRD, SEM, HRTEM, electron energy-loss spectroscopy (EELS) and magnetic measurements. It is found that the La0.5Ba0.5MnO3 nanowire has the typical cubic perovskite structure, each nanowire is composed of many small crystalline grains with different orientations. Valance state of manganese ion in La0.5Ba0.5MnO3 nanowires is determined by EELS technique. A "multi-nuclei" growth mode is proposed based on the microstructure analysis. The temperature dependence of magnetization has been briefly discussed.
采用阳离子表面活性剂在220℃合成了多晶La0.5Ba0.5MnO3纳米线。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）、电子能量损失谱（EELS）和磁性测量等一系列技术对所制备纳米线的结构、组成和物理性质进行了表征。发现La0.5Ba0.5MnO3纳米线具有典型的立方钙钛矿结构，每根纳米线由许多不同取向的小晶粒组成。利用EELS技术确定了La0.5Ba0.5MnO3纳米线中锰离子的价态。基于微观结构分析提出了“多核”生长模式。简要讨论了磁化强度与温度的关系。
