低热固相法合成镁铝尖晶石  

MgAl_2O_4 Spinel Synthesized by Solid State Reaction at Low-Heating Temperature

作　　者：占文[1] 王周福[1] 张保国[1] 王玺堂[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《稀有金属材料与工程》2009年第A02期34-37,共4页Rare Metal Materials and Engineering

摘　　要：以分析纯碱式乙酸铝、硝酸镁为原料,柠檬酸为配合剂,采用低热固相反应制备前驱体,然后通过煅烧的方式获得了MgAl2O4粉体。研究了煅烧温度、柠檬酸用量对MgAl2O4粉体性能的影响。结果表明,可在全固相条件下通过低热固相反应得到Mg和Al分子级混合的前驱体,该前驱体煅烧到700℃保温3h形成含有部分阳离子缺陷的尖晶石晶相,随温度升高,逐渐转化为结晶完整的尖晶石。柠檬酸使用量符合化学计量比n(C6H8O7):n(Mg+Al)为1:1时能够获得比表面积达到166m2/g的MgAl2O4粉体。MgAl2O4 precursor was synthesized via solid state reaction at low-heating temperature by AR basic aluminum acetate and magnesium nitrate as starting materials, and the citric acid as complex former. MgAl2O4 powders are formed by calcining the precursor. The dependence of MgAl2O4 powder performance on the calcination temperature and the quantity of the citric acid was studied. The results show that Mg and Al in precursor were blended in molecular level through solid state reaction at low-heating temperature. Spinel MgAl2O4 formed only at 700 ℃ for 3 h. The crystallized mass was a mixture of ordered and disordered phases of Mg-Al spinel. Well-crystallized spinel could be obtained when increasing the temperature. When the amount of the citric acid agrees with the ratio of n （C6H8O7）： n（Mg＋Al）= 1：1, the specific surface area of MgAl2O4 spinel could reach 160 m^2/g.

关 键 词：低热固相反应 镁铝尖晶石 前驱体 柠檬酸 

分 类 号：TQ133.1[化学工程—无机化工]