溶胶-凝胶法制备二钛酸钡粉体

Sol-Gel Synthesis of BaTi_2O_5 Powders

以钛酸丁酯和乙酸钡为前躯体原料,乙二醇甲醚和质量分数36%的乙酸为溶剂,冰醋酸为稳定剂,通过溶胶-凝胶法合成二钛酸钡(BaTi2O5)粉体.制备凝胶的最佳工艺条件:混合溶液的pH=4,n(Ba(Ac)2)∶n(Ti(OC4H9)4)∶n(CH3COOH)∶n(MOE)=1.00∶2.00∶7.97∶21.17,保温凝胶化温度为100℃.经X射线衍射(XRD)、热重/差热(TG-DTA)综合热分析表明:在最佳工艺条件下,当烧结温度为700℃,保温时间为2 h时,所合成单晶BaTi2O5粉体能稳定存在到1 200℃.

BaTi2O5 powder was synthesized by a sol-gel method using tetrabutyl titanate and barium acetate as precursor materials by using 36% acetic acid and ethylene glycol monomethyl ether as solvent, glacial acetic acid as stabilizing agent. The optimal teehnologcial conditions for producing gel have been obtained as follows： pH=4 mixture solution, n（Ba（Ac）2） ： n（Ti（OC4 H9）4） ： n（CH3COOH） ： n（MOE）=I. 00 ： 2.00 ： 7. 97 ： 21.17, gel-temperature 100 ℃. X-ray diffraction （XRD）, thermogravimetric/differential thermal analysis （TG-DTA） showed： at optimum technologcial conditions, single-phase BaTi2O5 can be stable at 1 200℃ as the precursors were heated at 700℃ for 2 h.