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摘要: 采用化学溶液方法在(111)Pt/Ti/SiO2/Si衬底上制备了Bi3.25La 0.75Ti3O12（BLT）和Bi3.25Nd0.75 Ti3O12（BNT）薄膜.x射线衍射测试表明，两种薄膜都为单一的层状钙钛矿结构.扫描电子显微镜分析显示，BNT薄膜由大而 均匀的棒状晶粒组成，BLT薄膜的组成晶粒则较小.采用紫外-近红外椭圆偏振光谱仪测试了2 00—1700nm波长范围的椭圆偏振光谱，拟合得到薄膜的光学常数（折射率和消光系数）和 厚度，确定BLT和BNT薄膜的禁带宽度分别为430和361eV，并采用单电子振子模型分析 了薄膜在带间跃迁区的折射率色散关系.
Abstract: The optical properties of Bi3.25La0.75Ti3O 12 (BLT) and Bi 3.25Nd0.75Ti3O12 (BNT) thin films de posited on (111)Pt/Ti/ SiO2/Si substrates by a chemical solution method were investigated. B oth BLT a nd BNT thin films showed single phase of bismuth-layered structure. The BNT fil m composed of the homogeneous and large rod-like grains, while the grains in BLT film were small. The optical constants (refractive index and extinction coeffic ient) in the wavelength range of 200—1700nm and the thickness of the films we re obtained by spectroscopic ellipsometry measurements. The optical band gaps o f BLT and BNT were estimated to be 430 and 361eV, respectively. The disper sion of the refractive index in the interband transition region was analyzed by using the single electronic oscillator model.
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