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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

(Pb,Ca)TiO3铁电薄膜光学性质的研究

李辉遒1; 唐新桂1,2; 刘毅1,3; 唐振方1; 张曰理1; 莫党1   

  1. 1. 中山大学物理系, 广州 510275; 2. 广东工业大学数理系, 广州 510090; 3. 深圳大学师范学院物理教育系, 深圳 518060
  • 收稿日期:1999-05-14 修回日期:1999-06-30 出版日期:2000-04-20 网络出版日期:2000-04-20

Optical Properties of Ferroelectric Calcium-modified Lead Titanate Thin Films

LI Hui-Qiu1; TANG Xin-Gui1,2; LIU Yi1,3; TANG Zhen-Fang1; ZHANG Yue-Li1; MO Dang 1   

  1. 1. Department of Physics; Zhongshan University; Guangzhou 510275; China; 2. Department of Mathematics & Physics; Guangdong University of Technology; Guangzhou 510090; 3. Department of Physical Education, Normal College, Shenzhen University, Shenzhen 518060, China
  • Received:1999-05-14 Revised:1999-06-30 Published:2000-04-20 Online:2000-04-20

PDF (PC)

980

摘要： 用溶胶凝胶法在Ｓｉ（１００）衬底上制备了（Ｐｂ，Ｃａ）ＴｉＯ３铁电薄膜样品，测量了其在２．３～５．０ｅＶ能量范围的椭偏光谱，并获得样品的膜厚和在该区间的光学常数谱．实验发现Ｐｂ离子被Ｃａ离子取代后，折射率峰向低能方向移动；同时随着Ｃａ含量的增加，（Ｐｂ，Ｃａ）ＴｉＯ３的吸收边向低能方向移动，表明Ｃａ离子取代Ｐｂ离子后，禁带宽度Ｅｇ减小．还讨论了引起折射率峰移动和禁带宽度Ｅｇ减小的原因．

关键词: 椭偏光谱, 光学常数, 铁电薄膜

Abstract: Calcium-modified lead titanate thin films deposited on si(100) substrate were prepared by sol-gel processing. The ellipsometric spectra of the PCT
ferroeclectric thin films were obtained in the spectral range of 2.3-5.0eV, and their optical constants(the refractive index n and the extinction
coefficient k) were determined. It was found that the peaks of the refractive indexes of the PCT thin films shift to the low energy region, their
absorption edges shift to lower energy with an increase in Ca doping, this suggests that the energy gap reduces after Ca ions occupied Pb ions sites.
The reasons of these shifts were also discussed.

Key words: ellipsometry, optical constants, ferroelectric films

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