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MgAl_2O_4粉体.研究了煅烧温度、柠檬酸用量对MgAl_2O_4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3 h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(C_6H_8O_7):n(Mg+Al)为1:1时能够获得比表面积达到166 m~2/g的MgAl_2O_4粉体.
MgAl_2O_4 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. MgAl_2O_4 powders are formed by calcining the precursor. The dependence of MgAl_2O_4 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 MgAl_2O_4 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 (C_6H_8O_7): n(Mg+Al)= 1:1, the specific surface area of MgAl_2O_4 spinel could reach 160 m~2/g.
参考文献
| [1] | Pacurariu a C;Lazau a I;Ecsedi a Z et al.[J].Journal of the European Ceramic Society,2007,27:707. |
| [2] | 杨或;贾殿赠;葛炜炜 et al.[J].无机材料学报,2004,20(08):881. |
| [3] | Sickafus Kurt E .[J].Journal of Nuclear Materials,2003,312:111. |
| [4] | Behera K;Barpanda P;Pratihar S K et al.[J].Materials Letters,2004,58:1451. |
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