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Loại tài liệu: Tài liệu số - Jounal article
Thông tin trách nhiệm: M. Isik
Nhà Xuất Bản:
Năm Xuất Bản: 2020
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Structural and optical characteristics of Bi12SiO20 single crystal grown by the Czochralski method were invesrntigated by virtue of X-ray diffraction (XRD) and spectroscopic ellipsometry measurements. XRD analysis indirncated that the studied crystal possesses cubic structure with lattice parameters of a ¼ 1.0107 nm. Spectralrndependencies of several optical parameters like complex dielectric constant, refractive index, extinction andrnabsorption coefficients were determined using ellipsometry experiments performed in the energy region ofrn1.2–6.2 eV. The energy band gap of Bi12SiO20 crystals was found to be 3.25 eV by utilizing absorption coefficientrnanalysis. Moreover, critical point energies were calculated as 3.54, 4.02, 4.82 and 5.58 eV from analyses of thernsecond energy derivative spectra of the complex dielectric constant
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