溶胶-凝胶法制备高锆含量PLZST反铁电陶瓷粉体

摘要

By using the lead acetate trihydrate (Pb(CH3COO)2·3H2O), lanthanum acetate (La(CH3COO)3), tin acetate (Sn(CH3COO)4), zirconium acetate (Zr(CH3COO)4) and tetrabutyl titanate (C16H36O4Ti) as the raw materials, the (Pb0.97La0.02)(Zr0.95Sn0.01Ti0.04) (PLZST) antiferroelectric ceramic powders were prepared by an improved sol-gel technology.The decomposability of the dried PLZST gel powders was studied by DSC-TGA differential thermal analysis.The influence of sintering temperature on PLZST ceramic powders was studied by XRD and SEM analysis.The results showed that the sintering temperature of dried PLZST gel powders should be above 550 ℃.When the sintering temperature is 850 ℃, the relatively pure perovskite phase PLZST ceramics were formed and the PLZST ceramic powders were spherical particles with average grain size about 200 nm.%以三水合乙酸铅(Pb(CH3COO)2·3H2O)、乙酸镧(La(CH3COO)3)、乙酸锡(Sn(CH3COO)4)、乙酸锆(Zr(CH3COO)4)、钛酸丁酯(C16H36O4Ti)为原料,采用改进的溶胶-凝胶(sol-gel)工艺制备(Pb0.97La0.02)(Zr0.95Sn0.01Ti0.04)O3(简称PLZST)反铁电陶瓷粉.采用DSC-TGA差热分析研究PLZST干凝胶的分解性能,用XRD和SEM对不同温度煅烧的PLZST陶瓷粉进行表征,分析煅烧温度对产物的影响.实验结果表明,PLZST干凝胶在550 ℃以上达到完全分解;干凝胶粉体在850 ℃煅烧2 h,可生成较纯钙钛矿相的高锆含量PLZST陶瓷粉体,粉体颗粒呈球形,平均晶粒约为200 nm.