低温固相反应法合成铝酸镧粉体及表征

发布时间：2018-04-04 16:38

  本文选题：铝酸镧　切入点：低温固相反应法　出处：《机械工程材料》2017年02期

【摘要】：以九水合硝酸铝、六水合硝酸镧为原料,柠檬酸为络合剂,通过低温固相反应法制备铝酸镧前驱体,分析了该前驱体的组成及热分解过程;将铝酸镧前驱体在不同温度下煅烧制备铝酸镧粉体,研究了铝酸镧粉体的合成温度以及煅烧温度对铝酸镧粉体形貌、粒径和比表面积的影响。结果表明:铝酸镧前驱体中形成了含有La-O-Al键的络合物,当煅烧温度达到700℃时开始生成铝酸镧晶体;随着煅烧温度的升高,铝酸镧晶体的晶格畸变程度减小,晶粒逐渐长大,粉体结晶度不断提高,粒径则逐渐减小;在1 000℃煅烧得到铝酸镧粉体的粒径最小,为0.310μm,比表面积最大,为16.58m~2·g~(-1)。
[Abstract]:The precursor of lanthanum aluminate was prepared by low temperature solid state reaction with aluminum nitrate hexahydrate as raw material and citric acid as complex agent. The composition and thermal decomposition process of the precursor were analyzed.Lanthanum aluminate powders were prepared by calcination of lanthanum aluminate precursor at different temperatures. The effects of synthesis temperature and calcination temperature on the morphology, particle size and specific surface area of lanthanum aluminate powder were studied.The results show that lanthanum aluminate crystals are formed in the precursor of lanthanum aluminate containing La-O-Al bond, and the crystal lattice distortion decreases with the increase of the calcination temperature, and the crystal grain grows gradually when the calcination temperature reaches 700 鈩，

本文编号：1710787