共沉淀法制备复合钙钛矿结构PLZST的研究

Preparation of PLZST with Complex Perovskite Structure by Coprecipitation

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.

A modified chemical coprecipitation route to synthesize homogeneous lead lanthanum zirconate stannate titanate (PLZST) precursors was described. The formation process of PLZST from the precursors was monitored by thermal analysis, and the phases were characterized by Xray diffraction. Compared with the solid-state reaction of constituent oxides, the PLZST powders prepared by coprecipitation have high purity, homogeneous and low synthesis temperature. The formation temperature of single perovskite PLZST is as low as 700degreesC in this method of preparation. Pb content analyzed by chemical methods indicates that the loss of Pb in PLZST synthesized at low temperature is minimal.