Measurement and Calculation of Optical Band Gap of Chromium Alminum Oxide Films

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The optical band gap is a basic property of optical materials.The measured band gap depends not only on the material but also on its characteristics such as crystallinity and stoichiometry.The optical band gap of chromium aluminum oxide films was measured and calculated by three different methods.Firstly, we used the conventional experimental-graphical method, which is commonly used.However, this method is applicable only to an all-crystalline phase or an all-amorphous phase.The second one was an experimantal-calculation method applicable to films composed of both crystalline and amorphous phases.We calculated the optical band gap between the highest occupied molecular orbital of O2p and the lowest unoccupid molecular orbital of Cr3d in Cr_<1.71>Al_<0.29O_3 films composed of both amorphous and crystalline phases.Also, a band gap for the d-d transition was obtained.Finally, the measured value was compared with the theoretical optical band gap calculated by the discrete variational-Xα(DV-Xα)method.
社団法人応用物理学会の論文
2000-08-15