Influence of gamma irradiation on the refractive index of Fe-doped barium titanate thin films |
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Authors: | O. Kongwut N. Jangsawang |
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Affiliation: | a Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand b Thailand Institute of Nuclear Technology (TINT), Bangkok, 10900, Thailand c Center of Innovative Nanotechnology, Chulalongkorn University, Bangkok, 10330, Thailand |
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Abstract: | Polycrystalline Fe-doped barium titanate (Fe-doped BaTiO3) thin films were grown by thermal decomposition of the precursors deposited from a sol-gel system onto quartz substrates. The changes in the transmittance spectra induced by gamma irradiation on the Fe-doped BaTiO3 thin films were quantified. The values for the optical energy band gap were in the range of 3.42-3.95 eV depending on the annealing time. The refractive index of the film, as measured in the 350-750 nm wavelength range was in the 2.17-1.88 range for the as prepared film, and this increased to 2.34-1.95 after gamma irradiation at 15 kGy. The extinction coefficient of the film was in the order of 10−2 and increased after gamma irradiation. We obtained tuneable complex refractive index of the films by exposure to various gamma rays doses. |
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Keywords: | Gamma irradiation Fe-doped BaTiO3 Sol-gel method Refractive index |
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