【摘要】 以TiCl4和MgCl2混合液为原料液、NaOH为沉淀剂,采用化学沉淀法制备纳米钛酸镁粉体。考察了沉淀剂浓度、原料液中Mg2+与Ti4+的摩尔比、煅烧温度等因素对目的产物颗粒大小和晶型的影响;采用透射电镜和X射线衍射等多种分析测试方法对制得粉体进行了表征。实验结果表明:当镁钛混合液中的Mg2+与Ti4+的摩尔比为1.2(固定钛离子浓度为0.5 mol/L)、沉淀剂NaOH浓度为6 mol/L、反应温度98℃、镁钛混合液与NaOH溶液的体积比为1∶1、煅烧温度为800℃时,制备出了平均粒径约为55 nm、结晶度好、形貌为球形的纳米钛酸镁粉体。更多还原

【Abstract】 Nano-sized magnesium titanate powders was prepared by a chemical-reactive precipitation method,in which the mixture solution of MgCl₂ and TiCl₄ acted as the starting material and NaOH as precipitant,respectively.The effects of the concentration of NaOH solution,Mg²⁺ and Ti⁴⁺ molar ratio in the starting reactant and the calcining temperature on the particle size and phase composition of magnesium titanate were studied.The magnesium titanate powders obtained were characterized by using XRD,TG,DSC and TEM.The experimental results show that the feasible conditions for the synthesis of MgTiO₃ powders are as follows: the concentration of the precipitant is 6?mol/L,the volume ratio of the mixture solution to the NaOH solution 1∶1,the Mg²⁺/Ti⁴⁺ molar ratio 1.2∶1,with the reacting temperature at 98?℃,and the ordered hexagonal MgTiO₃ powders with a mean particle size of 55?nm are obtained by calcined at 800?℃.更多还原