Infrared optical properties of Ba0.8Sr0.2TiO3 ferroelectric thin films

被引：32

作者：

Huang, ZM ^{[1
]}

Zhang, ZH ^{[1
]}

Jiang, CP ^{[1
]}

Yu, JA ^{[1
]}

Sun, JL ^{[1
]}

Chu, JH ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 22期

关键词：

D O I：

10.1063/1.1330224

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Infrared optical properties of barium strontium titanate Ba0.8Sr0.2TiO3 thin films grown on Pt/Ti/SiO2/Si substrates are studied by infrared spectroscopic ellipsometry (IRSE) in the spectral range of 2.5-12.6 mum. The refractive index and extinction coefficient of Ba0.8Sr0.2TiO3 are determined by fitting the IRSE data using a classical dielectric function formula. As the wavelength increases, the refractive index decreases, but on the contrary, the extinction coefficient increases. The absorption coefficient is greater than 1000 cm(-1) for the wavelength over 12.1 mum, but very small and less than 100 cm(-1) under 5.3 mum. The effective static ionic charge has also been derived, which is smaller than it would be in a purely ionic material for Ba0.8Sr0.2TiO3 thin films. (C) 2000 American Institute of Physics. [S0003-6951(00)03649-4].

引用

页码：3651 / 3653

页数：3

共 20 条

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