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Photochromic glasses having composition (SiO2)45(B2 O 3)35(Al2O3)7.5(Na2O)12.5(AgBr), (Cu2O) doped with (CoO) x , in which, x = 0, 0.006, 0.02 and 0.07 g were prepared using the conventional melt technique. The amorphous nature of these glass samples was confirmed using X-ray diffraction analysis at room temperature. The absorption measurements in the infrared region of the spectrum were recorded in the wave number range (4000–400) cm?1. Spectral reflectance and transmittance at normal incidence of the prepared glass samples were recorded with a spectrophotometer in the spectral range 200–2500 nm. Experimental and theoretical densities of the prepared glass samples were measured, calculated and compared. Analytical expressions were used to calculate the real and imaginary parts of the refractive indices. Dispersion parameters such as: single oscillator energy, dispersion energy, average oscillator wavelength, and Abbe’s number were deduced and compared. Absorption dispersion parameters such as: optical energy gap for direct and indirect transitions, Urbach energy and steepness parameter were calculated. Effects of doping with cobalt oxide CoO as a transition metal on linear and predicted nonlinear optical parameters were investigated and interpreted. Experimental results indicate that there is an optimum concentration of cobalt doping around 0.006 g. The optical band gap decreases with increasing doping and causes an increase in nonlinear optical parameters. Doping with cobalt oxide improves the linear and nonlinear optical properties of the prepared glasses. 相似文献
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Ramzy E. El-Zaiat Mohammad S. El-Shobokshy Zohair S. Abdul Jabbar 《Aerosol science and technology》2013,47(1):21-42
An experimental study was carried out to determine the effect of the design parameters of blade angle, spacing, and width on the static pressure drop and mass efficiency of a louvre dust separator for the two cases of solid blades and a newly modified slotted blade design. The experiments were carried out using model test sections. Computer models of louvre blade inertia air cleaner performance were developed in an attempt to predict the mass efficiency. Conclusions were drawn regarding the best values of the design variables for optimum mass efficiency and pressure drop. 相似文献
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El-Kameesy S. U. El-Zaiat S. Y. Youssef G. M. Saudi H. A. El-Fiki S. A. Abu-raia W. A. 《SILICON》2019,11(3):1505-1515
Silicon - Optical spectral analysis of a glass system with composition xPbO – 20 SiO2–10 Na2O – (70 - x) B2O3, where x = 20, 30, 40, 50 and 60 mol %, was studied. The investigated... 相似文献
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