乙醇基溶胶-凝胶法制备BNKLT粉体及压电陶瓷  

BNKLT Nano Powders and Lead-free Piezoelectric Ceramics Prepared by Ethanol-based Sol-Gel Method

作　　者：姜宁 廖运文[1,2] 张林慧 王文芳 李伟 刘育芳 

机构地区：[1]化学合成与污染控制四川省重点实验室,四川南充637009 [2]西华师范大学应用化学研究所,四川南充637009

出　　处：《压电与声光》2013年第2期269-272,共4页Piezoelectrics & Acoustooptics

基　　金：四川省应用基础研究基金资助项目(2011JY0058)

摘　　要：以乙醇为溶剂,氧化物和碳酸盐为原料,采用溶胶-凝胶(Sol-Gel)法制备了Bi0.5(Na0.7K0.2Li0.1)TiO3(BNKLT)纳米粉体和无铅压电陶瓷。利用IR,TG-DSC,XRD,SEM等测试技术研究了乙醇基Sol-Gel法制备BNKLT纳米粉体及无铅压电陶瓷的工艺参数。实验表明,乙酰丙酮与钛酸四丁酯的摩尔比N≥1.0时,反应温度60℃,pH=2.0～2.5时,能制备出稳定性良好的乙醇基溶胶,凝胶在600℃内预烧即可获得单一钙钛矿结构的BNKLT纳米粉体,晶粒大小约20nm,并于1 050℃条件下烧结出致密度较高的陶瓷。性能测试表明,该方法制备的压电陶瓷俱有优良的电学性能:压电常数d33=192pC/N,机电耦合系数kp=0.32,介电常数εr=1 096,介电损耗tanδ=0.039,品质因数Qm=79。Using ethanol as the solvent, oxides and carbonates as starting materials, the nano-powders and lead- free piezoelectric ceramics of Bio. 5（Na0.7K0.2 Li0.1）TiO3 （BNKLT） were prepared by Sol-Gel method. Using the IR, TG-DSC,XRD,SEM and so on, the influence of process parameters on the nano-powders and lead-free piezoelectric ceramics by ethanol-based Sol-Gel method were studied. Experimental results showed that the stable, clear, trans- parent sol can be prepared when the stoichiometry of aeetylacetone and tetrabutyl titanate is （N）≥1.0, the reaction temperatureS60℃ and pH=2.0-2.5. The BNKLT nano-powders with pure perovskite structure were prepared at 600℃, and the grain size of powders was about 20 nm, and the dense ceramics of BNKLT were sintered at 1 050℃. Performance tests showed that piezoelectric ceramics were prepared by this method which have excellent electrical properties of d33 =192 pC/N,kp=0. 32,εr =1 096, tan δ=0. 039,Qm=79.

关 键 词：乙醇 溶胶-凝胶(Sol-Gel)法 BI0 5(Na0 7K0 2Li0 1)TiO3 纳米粉体 无铅压电陶瓷 

分 类 号：TN384[电子电信—物理电子学]