【摘要】 低温燃烧合成(LCS)钛酸钡粉体的工艺是一种能够直接在低温合成四方相纳米钛酸钡粉的方法。在硝酸盐和柠檬酸体系中,以推进剂化学为理论依据,实验得出各反应物间的最佳摩尔配比,考察了前驱体溶液pH值等对反应过程和最终产物的影响。应用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等对粉体的结构、形貌进行了分析。结果在300℃点火生成晶粒度在100nm左右无杂质相的四方相钛酸钡粉。更多还原

【Abstract】 Nanoparticle tetragonal barium titanate has been directly synthesized by lowtemperature combustion synthesis process(LCS). According to thermochemical calculations of propellant chemistry theory, the optimum molar ration of reactants was obtained in the system of Ba(NO3)2TiO(NO3)2citric acidNH4NO3. The influences of the precursor solution pH value and the heating temperature on the reaction process and the properties of the final product were extensively investigated. With the aids of XRD, SEM, TEM, the crystal structure and morphology were analyzed. The results show that the tetragonal BaTiO3 without impurity phase was produced at 300℃ ignited temperature, whose crystalline size was about 100nm.更多还原