摘要
以乙酸钡和钛酸丁酯为原料,分别采用沉淀法和非水解溶胶-凝胶(NHSG)法制备钛酸钡纳米粉体,利用DTA-TG,XRD、FT-IR以及TEM等测试手段研究了钛酸钡的物相转变过程,探讨了两种方法不同的微观反应机制。研究结果表明:采用沉淀法,以去离子水和乙醇为复合溶剂,乙酰丙酮为螯合剂,尿素为沉淀剂,能够在750℃下制备出钛酸钡纳米粉体,并且红外测试表明沉淀物中有Ti-OH的振动峰位和CO_3^(2-)的特征峰位;采用NHSG法,以丙三醇为单一溶剂,能够在650℃下合成钛酸钡纳米粉体;与沉淀法合成钛酸钡的反应过程不同,NHSG法合成钛酸钡是由于先发生脱酯反应,形成Ba-O-Ti异质键合,然后直接晶化成钛酸钡,这是NHSG法能够低温合成钛酸钡纳米粉体的原因。
BaTiO_3（BT） nano powders were prepared via precipitation method and non-hydrolytic sol-gel（NHSG） method by using barium acetate and titanium tetrabutoxide as precursors, respectively. The process of BT phase transformation and the reaction mechanism of these two methods were researched by DTA-TG, XRD, FTIR, TEM, etc. The results show that BT nano powder can be synthesized at 750 ℃ via precipitation method using deionized water and ethonal as complex solvent, acetylacetone as chelating agent, and urea as precipitant; it can also be synthesized at 650 ℃ via NHSG method using glycerol as solvent; FT-IR indicates that the synthesis mechanism of NHSG method for BT nanopowders is different from that of precipitation method, the Ti-OH and CO_3^（2-） characteristic peaks were presented via precipitation method, while the Ba-O-Ti heterogeneous bond was formed in the de-esterification of polycondensates via NHSG method, and then the xerogel was turned into the BT nanocrystalline directly after calcination. Therefore, the BT nanopowders were obtained at low temperature.
出处
《陶瓷学报》
CAS
北大核心
2016年第1期44-48,共5页
Journal of Ceramics
基金
国家自然科学基金项目(51162013
51362014)
