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.
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.
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