Li_2SiO_3粉体的水热合成

Synthesis of Li_2SiO_3 Powder via Hydrothermal Process

以LiOH·H_2O和正硅酸乙酯(TEOS)为原料,用水热法低温合成了Li_2SiO_3粉体,系统讨论了水热反应时间、温度及pH等因素对粉体合成的影响;采用XRD、sEM和FT-IR等手段对Li_2SiO_3粉体的物相、颗粒形貌及稳定性等进行了表征。结果表明:在100℃下水热反应72 h可以得到纯的Li_2SiO_3粉体,粉体热稳定性较高,煅烧温度达1 100℃时都未有相变发生;扫描照片显示,水热法合成的Li_2SiO_3粉体粒径约为100～200 nm。

Li2SiO3 powders were prepared at low temperature via hydrothermal process using LiOH·H2O and TEOS as raw materials. The effects of the reaction time, temperature and pH value on the preparation of Li2SiO3 powders were investigated systematically. The morphology and thermal stability of Li2SiO3 powders were characterized by means of XRD, SEM and FT-IR. The results showed that pure Li2SiO3 powders were obtained via hydrothermal treatment at 100 ℃ for 72 h. This powders showed very good thermal stability that no decomposing reaction or phase change would happen even after calcined at 1 100 ℃. The nano Li2SiO3 powders （100-200 nm） were obtained at 100℃ as observed by SEM.