论文部分内容阅读
采用水热法,以TiCl3、Co(CH3COO)2.4H2O为原料制备了纳米钛酸钴(CoTiO3)粉体。用X射线衍射、激光Raman光谱、扫描电子显微镜、透射电子显微镜分析了水热温度、前驱体溶液pH值、水热时间对CoTiO3晶相、生长取向和显微结构的影响。结果显示:升高水热温度至280℃有利于CoTiO3结晶性能的提高,促进了晶体由(110)向(104)晶面取向生长的转变。pH值在8.0～10.0范围内,粉体经历了“片状-颗粒状-片状”的形貌变化,pH>9.0时,CoTiO3的纯度和结晶度下降。适当延长反应时间至24h有利于CoTiO3结晶性能的提高。
Hydrothermal method was used to prepare cobalt titanate (CoTiO3) powders with TiCl3 and Co (CH3COO) 2.4H2O as raw materials. The effects of hydrothermal temperature, precursor solution pH and hydrothermal time on the crystal phase, growth orientation and microstructure of CoTiO3 were analyzed by X-ray diffraction, laser Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. The results show that increasing the hydrothermal temperature to 280 ℃ is beneficial to the improvement of the crystalline properties of CoTiO3, and accelerating the crystal orientation transition from (110) to (104) planes. The pH value ranged from 8.0 to 10.0, and the powder underwent the “flake-granule-flake” morphological changes. When pH> 9.0, the purity and crystallinity of CoTiO3 decreased. Appropriate to extend the reaction time to 24h is conducive to the improvement of crystalline properties of CoTiO3.