Publication date: 15 January 2018
Source:Journal of Crystal Growth, Volume 482
Author(s): Ji-Long Han, Qing-Fen Meng, Sheng-Li Gao
Using a novel flux method, a hexagonal plate of Co3 O4 was directly synthesized. In this method, CoCl2 ·6H2 O, NaOH, and the cosolvent H3 BO3 were heated to 750 °C for 2 h in a corundum crucible. The products were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and high-resolution transmission electron microscope (HRTEM). Furthermore, XRD studies indicated that the product consisted of a cubic phase of Co3 O4 , and the phase existed in a completely crystalline form. Then, SEM results indicated that these hexagonal plates tiered up and they had diameters in the range of 2–10 µm. According to the results of SAED and HRTEM analyses, the interlayer spacing was about 0.24 nm, which corresponds to the interlayer distance of (3 1 1) crystal plane of cubic Co3 O4 .
Source:Journal of Crystal Growth, Volume 482
Author(s): Ji-Long Han, Qing-Fen Meng, Sheng-Li Gao