摘要
采用水热法,成功地合成了一系列单晶La1-xCaxMnO3(x=0.3、0.5、0.75)纳米线.X射线衍射(XRD)的结果表明所制备的样品是纯的La1-xCaxMnO3正交相(x=0.3、0.5、0.75)纳米线.透射电子显微镜(TEM)的照片清晰地显示所制备的样品是由大量直径均匀(约90nm)、长度从几微米至几十微米的La1-xCaxMnO3的单晶纳米线构成.La0.5Ca0.5MnO3纳米线清晰的高分辨电子显微镜(HRTEM)的图片表明纳米线的表面是光滑的,没有任何缺陷且La0.5Ca0.5MnO3纳米线沿<100>方向生长.La0.5Ca0.5MnO3纳米线磁测量的结果表明相对于块材来说纳米线的Tc有明显地提高,这是由于晶胞收缩和形状各向异性所致.
A series of single-crystalline La1-xCaxMnO3 nanowires were successfully prepared by a hydrothermal method. X-ray diffraction (XRD) results demonstrate that the La1-xCaxMnO3 nanowires have orthorhombic perovskite structure without any impurity phases. Transmission electron microscope (TEM) images clearly show that the as-synthesized samples are made up of large quantities of single crystal nanowires with lengths ranging from several to several tens of micrometers and uniform diameter (about 90nm). The high-resolution transmission electron microscope(HRTEM) investigations of La0.5Ca0.5MnO3 nanowires indicate that the nanowires have very clean surfaces without any defects and grow along 〈 100 〉 direction. The result of magnetic measurement indicates that the La0.5Ca0.5MnO3 nanowires have an enhanced Tc due to the shrinkage of unit cell volume and shape anisotropy.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期243-246,共4页
Journal of Inorganic Materials
基金
海外杰出青年基金(51080202)
安徽省教育厅资助项目(2006KJ103B)