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用化学溶液方法在宝石衬底及有LaNiO3缓冲层的Pt/TiO2/SiO2/Si衬底上制备了92%Pb(Mg1/3Nb2/3)O3-8%PbTiO3(PMNT)薄膜,X射线衍射测试结果表明:在有LaNiO3缓冲层的Pt/TiO2/SiO2/Si衬底上制备的PMNT薄膜几乎是纯钙钛矿相,且薄膜呈现(110)择优取向.通过对Pt/TiO2/SiO2/Si衬底上的PMNT薄膜在2·5—12·6μm波长范围内的红外椭圆偏振光谱测试,并拟合得到了PMNT薄膜在2·5—12·6μm波长范围内的光学常数(n和k),通过对宝石衬底上的PMNT薄膜在200—1100nm波长范围内的可见-紫外透过率测试,并拟合得到了PMNT薄膜在200—1100nm波段的光学常数(n和k)和吸收系数α,进而推导出PMNT薄膜的禁带宽度为4·03eV.
A 92% Pb (Mg1 / 3Nb2 / 3) O3-8% PbTiO3 (PMNT) thin film was deposited on a sapphire substrate and a Pt / TiO2 / SiO2 / Si substrate with a buffer layer of LaNiO3 by a chemical solution method. The results of X-ray diffraction The results show that the as-deposited PMNT film on the Pt / TiO2 / SiO2 / Si substrate with LaNiO3 buffer layer is almost pure perovskite phase, and the film has the preferential orientation of (110) The results show that the optical constants (n and k) of the PMNT film in the range of 2.5-12.6μm are fitted by infrared ellipsometry in the range of 2.5-12.6μm, Through the visible-UV transmittance test of the PMNT film on the gem substrate in the wavelength range of 200-1100 nm, the optical constants (n and k) and the absorption coefficient α of the PMNT film in the wavelength band of 200-1100 nm were obtained. Further, the forbidden band width of the PMNT film is deduced as 4.03eV.