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溶胶-凝胶法PLT薄膜的形成与热处理温度关系研究

沈鸽; 杜丕一   

  1. 浙江大学硅材料国家重点实验室 杭州 310027
  • 收稿日期:2001-01-12 修回日期:2001-03-02 出版日期:2002-01-20 网络出版日期:2002-01-20

Relationship between Phase Formation and Calcination Temperature of Sol-Gel Derived PLT Thin Film

SHEN Ge; DU Pi-Yi   

  1. State Key Lab of Silicon Materials; Zhejiang University; Hangzhou 310027; China
  • Received:2001-01-12 Revised:2001-03-02 Published:2002-01-20 Online:2002-01-20

PDF (PC)

1189

被引次数

6

摘要： 利用溶胶－凝胶法合成了透明溶胶和白色稳定乳浊液两种前驱体，通过Ｄｉｐ－ｃｏａｔｉｎｇ方法分别利用掺入及不掺入同配方的晶体微粉的这两种前驱体制备了Ｐｈ０．９Ｌａ０．１５ＴｉＯ３ 薄膜，并通过 Ｘ射线衍射（ＸＲＤ）；扫描电子显微镜（ＳＥＭ）和介电常数测试等手段进行了形成特性研究和比较．结果显示，利用白色乳浊液前驱体制备的Ｐｂ０．９　Ｌa０．１５ＴｉＯ３ 薄膜，其最初形成钙钛矿相的温度比利用透明溶胶制备的同样薄膜的温度降低约４０～５０℃；利用透明溶胶前驱体制备的Ｐｂ０．９Ｌａ０．１５ＴｉＯ３薄膜在热处理温度高到约５７５℃时，钙钛矿相的晶格常数相应下降；约在５２５℃热处理时，薄膜居里温度出现在室温附近；较高的热处理温度时，薄膜中形成的钙钛矿相中Ｌａ的固溶度相对较小，反之则Ｌａ的固溶度较高．

关键词: PLT薄膜, 溶胶-凝胶法, 温度, 晶相形成

Abstract: Two kinds of precursors, being transparency and milky in status respectively, were prepared. Thin films of Pb0.9La0.15TiO3 were coated on glass
substrates with the two precursors added with or without crystallite nano powders of Pb0.9La0.15TiO3 respectively by dip-coating methods. Scanning
electron microscopy (SEM), X-ray diffraction (XRD) and dielectric spectroscopy were respectively used to observe the morphology, phase status and dielectric
constant of the films. In conclusion, the initial temperature of forming the perovskite phase of Pb0.9La0.15TiO3 thin film derived from the
milky precursor is 40-50℃ lower than that from transparency precursor. On the other hand, crystal lattice of the perovskite phase of the film derived
from the transparency precursor decreases while the calcination temperature is in high level of about 550℃ and up. The Curie point is near room temperature
when the film is calcined at about 525℃. And the solid solubility of La in the perovskite phase decreases with increasing the calcination temperature of the film, and vice versa.

Key words: PLT thin film, sol-gel, calcination temperature, phase formation

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