PZT纳米晶的改进型溶胶-凝胶法制备及其生长过程研究

Study on synthesis of PZT nano-crystalline powders by the modified sol-gel method and the crystalline transition process

以乙二醇为溶剂，硝酸锆为锆源，采用改进的溶胶-凝胶法，通过优化工艺参数制备了纳米Pb（Zr0.52Ti0．48）O3（PZT）。通过对工艺条件研究，揭示了体系的凝胶化可通过升高温度和增加pH值来实现。通过对溶胶的红外光谱分析给出了溶胶、凝胶形成的机理。通过TG-DTA、XRD、SEM、TEM等手段对从凝胶到PZT纳米晶的生长过程及性能进行了表征。实验证明，改进后工艺简单易行，溶胶稳定，干凝胶在650℃热处理2h，获得较完整的钙钛矿型PZT，粒径约为50-100nm。

Lead zirconate titanate （PZT） nano-crystalline powders （Zr/Ti = 52/48） were prepared by optimizing the technology process of the modified sol-gel method. Ethylene glycol was used as the solvent, and zirconium nitrate was used as the zirconium source. By studying the technology process factors of the sol-gel, it proved that the gelatination of the sol could be realized by increasing temperature and pH. The fbrmation mechanisms of the sol and gel were discussed through analyzing the IR spectra of the sol. The transition process from gel to PZT nano-crystalline powders was characterized by TG- DTA, XRD, SEM and TEM. The results showed that the modified sol-gel process was easy to control. The full perovskite PZT was obtained after the dry-gel was annealed at 650℃ for 2h, and the particle size of the PZT crystal was about 50 -100nm.