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Some Optical Aspects of Thermally Evaporated Lead Oxide Thin Films

100%
Aly S., Kaid M., El-Sayed N.
Acta Physica Polonica A
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2013
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vol. 124
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issue 4
713-716
EN
The optical properties of lead oxide samples prepared using thermal evaporation technique on unheated glass substrates with different film thicknesses have been studied. The structural characteristics of a lead oxide sample was investigated using X-ray diffraction and it is confirmed to be in the amorphous state. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance (T_{UV}, T_{VIS} and T_{Sol}) in ultraviolet, visible and solar regions was calculated and found to be affected by film thickness. The dependence of absorption coefficient on wavelength was also reported. The energy gap was calculated and has been observed around 3.7 eV.
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Optical Characterization of (CdO)_{x}(ZnO)_{1 - x} Composite by Spray Pyrolysis Technique

100%
Elmaghraby E., Kaid M., Zaki M.
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vol. 125
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issue 1
82-86
EN
Composite cadmium oxides-zinc oxides, (CdO)_{x}(ZnO)_{1 - x}, thin films are grown with variable composition, x, by non-conventional spray pyrolysis technique from two separate cavities. X-ray diffraction proves the formation of cadmium and zinc peroxides upon deposition. Further annealing in air causes a loss of crystallographic order in zinc oxide grains. Annealing does not affect the structure of cadmium peroxide. The optical constants are estimated by the Murmann exact equation from transmittance and reflectance in the wavelength range between 400 and 2400 nm and show normal dispersion. Highest luminescent yield is assigned for samples with composition x = 0.5. Annealing causes increase in luminescence yield of (CdO)_{x}(ZnO)_{1 - x} films that could be explained in the framework of structural change.
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