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2007 , Vol. 22 >Issue 2: 243 - 246

DOI: https://doi.org/10.3724/SP.J.1077.2007.00243

研究论文

水热合成单晶La 1-x Ca x MnO3系列纳米线

  • 晋传贵 ,
  • 张涛 ,
  • 李晓光
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  • 1. 安徽工业大学材料科学与工程学院, 马鞍山 243002; 2. 安徽省金属材料与加工重点实验室, 安徽工业大学, 马鞍山 243002; 3. 中国科学技术大学物理系, 合肥 230026

收稿日期: 2006-04-27

  修回日期: 2006-07-10

  网络出版日期: 2007-03-20

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Synthesis of a Series of Single-crystalline La 1-x Ca x MnO3 Nanowires by Hydrothermal Method

  • JIN Chuan-Gui ,
  • ZHANG Tao ,
  • LI Xiao-Guang
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  • 1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China; 2. Anhui Key Laboratory of Metal Materials and Processing, Anhui University of Technology, Maanshan 243002; 3. Department of Physics, University of Science and Technology of China, Hefei 230026

Received date: 2006-04-27

  Revised date: 2006-07-10

  Online published: 2007-03-20

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摘要

采用水热法, 成功地合成了一系列单晶La 1-x Ca x MnO3(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La 1-x Ca x MnO3 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La 1-x Ca x MnO3的单晶纳米线构成. La 0.5 Ca 0.5 MnO 3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La 0.5 Ca 0.5 MnO3纳米线沿<100>方向生长. La 0.5 Ca 0.5 MnO 3 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.

关键词： 水热法; La1-xCaxMnO3; 纳米线; 磁测量

本文引用格式

晋传贵 , 张涛 , 李晓光 . 水热合成单晶La 1-x Ca x MnO3系列纳米线[J]. 无机材料学报, 2007 , 22(2) : 243 -246 . DOI: 10.3724/SP.J.1077.2007.00243

Abstract

A series of single-crystalline La 1-x Ca x MnO 3 nanowires were successfully prepared by a hydrothermal method. X-ray diffraction (XRD) results demonstrate that theLa 1-x Ca x MnO 3 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 La 0.5 Ca 0.5 MnO 3 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 La 0.5 Ca 0.5 MnO3 nanowires have an enhanced Tc due to the shrinkage of unit cell volume and shape anisotropy.

Key words： hydrothermal method; La1-xCaxMnO3; nanowires; magnetic measurement

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