Low Temperature Synthesis of （Pb,La）（Zr,Sn,Ti）O3 Powders by Citrate Process

Lead lanthanum zirconate stannate titanate （PLZST） powders with homogeneous composition were synthesized at a relatively low temperature of 650 ℃ by a citrate process based on the Pechini method. Clear aqueous solutions were prepared from inorganic salts, and citric acid was added as a chelating agent to attain precursor sols. Dried gel-precursors were calcined at different temperatures for various time. The perovskites powders were obtained at 650 ℃ for 1 hour. XRD and SEM results show that the powders were single-phase and ultrafine particles.     

共沉淀法制备复合钙钛矿结构PLZST的研究

用改进的化学共沉淀法制备PLZST前驱体,讨论了共沉淀的最佳pH值范围.通过DTA-TG和XRD详细研究相组成随煅烧温度的变化,并通过和固相合成PLZST多晶料的条件比较可知,共沉淀法合成PLZST多晶料具有纯度高、组份均匀、合成温度低等特点.研究表明在700℃低温下即能合成纯钙钛矿相PLZST多晶料.利用化学分析法测定不同温度下合成的PLZST的铅含量表明低温下合成的PLZST,铅挥发量极少,不会由于铅的挥发造成计量比的改变和形成杂相.