PZT纳米晶粉体的水热合成及表征(英文)

Hydrothermal Synthesis and Characterization of Nanocrystalline PZT Powders

本文选取近于MPB的组成Pb(Zr0.52Ti0.48)O3进行了研究。通过水热法合成了纯相钙钛矿型纳米晶锆钛酸铅(PZT)粉体。所用原料试剂为分析纯Pb(NO3)2、Zr(NO3)4.5H2O、Ti(OC4H9)4,NaOH作为矿化剂。原料试剂按Pb(Zr0.52Ti0.48)O3化学计量比混合放入50mL内衬聚四氟乙烯的高压釜中,填充度为70%。高压釜在170～270℃之间选择一定温度加热2h后在冰水中冷却到室温。前躯体及水热处理的粉体通过XRD和SEM进行表征。PZT相在220℃加热2h开始出现。在270℃加热2h合成了纯相钙钛矿型纳米晶PZT粉体。粉体的平均尺寸为25nm。

PZT with a composition of Pb（Zr0.52Ti0.48）O3, which is near the morphotropic phase boundary （MPB） was selected in the present study. Nano-sized lead zirconate titanate （PZT） powders were synthesized via hydrothermal synthesis rout. All starting materials are analytical grade and used without further purification. Stoichiometric amounts of lead nitrate [Pb（NO3）2], zirconium nitrate hydrate [Zr（NO3）4-5H2O], tetra-butyl titanate [Ti（OC4Hg）4] were used as raw materials and NaOH as the mineralizer. They were mixed and put into a Teflon-lined autoclave of 50 mL capacity filled up to 70% of its capacity. The autoclave was maintained at 170-270℃ for 2 h, and then cooled to room temperature in icy water. The precursors and hydrothermal-treated powders were characterized by XRD and SEM. PZT phase started to form at a soaking temperature of as low as 220 ℃ for 2 h, while phase-pure PZT powders were obtained at 270℃ for 2 h. The PZT powder consists of single-phase perovskite nanocrystals with an average size of 25 nm.