Infrared optical properties of Ba(Zr0.20Ti0.80)O3 and Ba(Zr0.30Ti0.70)O3 thin films prepared by sol-gel method |
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| Authors: | Aiyun Liu Jianqiang Xue Jinglan Sun Junhao Chu |
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| Affiliation: | a Department of Physics Shanghai Normal University, 100 Gui Lin Road, Shanghai 200234, PR China
b National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, PR China |
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| Abstract: | Ba(ZrxTi1−x)O3 (BZT) (x = 0.20 and 0.30) thin films are deposited on Pt(1 1 1)/Ti/SiO2/Si(1 0 0) substrate by sol-gel method. X-ray diffraction patterns show that the thin films have a good crystallinity. Optical properties of the films in the wavelength range of 2.5-12 μm are studied by infrared spectroscopic ellipsometry (IRSE). The optical constants of the BZT thin films are determined by fitting the IRSE data using a classical dispersion formula. As the wavelength increases, the refractive index decreases, while the extinction coefficients increase. The effective static ionic charges are derived, which are smaller than that in a purely ionic material for the BZT thin films. |
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| Keywords: | 77.55.+f 78.20.&minus e 78.20.Ci |
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