(Pb,Ca)TiO_3铁电薄膜光学性质的研究  

Optical Properties of Ferroelectric Calcium-modified Lead Titanate Thin Films

作　　者：李辉遒[1] 唐新桂[1,2] 刘毅[1] 唐振方[1] 张曰理[1] 莫党[1] 

机构地区：[1]中山大学物理系 [2]广东工业大学数理系,5100902

出　　处：《无机材料学报》2000年第2期299-303,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金!(19874081)

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．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 Ph ions sites. The reasons of these shifts were also discussed.

关 键 词：椭偏光谱 铁电薄膜 光学性质 三氧化钛 钛酸铅 

分 类 号：O484.41[理学—固体物理] TN304.905[理学—物理]