Effect of exchange of Bi +3 b y Nb +5 on the structural and optical properties of some (BBiNb) 2 O 7 CaO oxide glasses

El‐Mansy, M. K.; Gomaa, Hosam M.; Hendawy, N.; Morsy, Ammar S.

doi:10.1016/j.jnoncrysol.2018.01.036

Cited by 22 publications

(9 citation statements)

References 13 publications

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“…[ [22][23] Davis and Motto developed the following mathematical formula to describe the absorption coefficient as a function of both the photon energy hν and the direct/indirect optical band gap Eopt. Where ξ = 2 for allowing direct transitions and ξ = ½ for allowing indirect transitions [24][25]. The optical band gaps for both direct and indirect transitions can be obtained by plotting (αhν) 2 and (αhν) 1/2 verses hν respectively, then extrapolate the linear portion to intersect the horizontal axis (hν) at point represents the optical band gap [26][27], as seen in the figure 8 and figure 9.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Bismuth Borate Glasses Doped with Zinc and Calcium Oxides

Hassaan¹,

Saudi²,

Gomaa³

et al. 2020

J. Mater. Appl.

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Some bismuth-borate oxide glass' samples were prepared by the fast quenching method, where B2O3 was replaced with equal concentrations of ZnO and CaO. X-ray diffraction (XRD) was used to examine the internal structure and Fourier transform infrared (FTIR) to identify building units and bonds throughout the studied structural matrices. XRD showed that all samples have short range order structural nature, while FTIR demonstrated some of Zn2+ acted as glass network formers and all Bi3+ acted as glass. UV-visible measurements and calculations showed a decreasing in the energy band gap from 3.83 eV to 1.73 eV with decreasing B2O3 content. Also with decreasing B2O3 content, both real refractive index and metallization factor decreased from 3.1 to 1.9 and from 0.56 to 0.71, respectively. For the studied glass' samples, density and molar volume showed inverted behaviors, where the density decreased while the molar volume increases with decreasing B2O3.

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Section: Resultsmentioning

confidence: 99%

Optical Properties of Bismuth Borate Glasses Doped with Zinc and Calcium Oxides

Hassaan¹,

Saudi²,

Gomaa³

et al. 2020

J. Mater. Appl.

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“…Figure (7) illustrates that all the studied samples have a wide transmission window extended over all the visible range, which may suggest them for multi applications in this region. According to relation ( 4), [34], both the optical absorption of each sample and its thickness (t) were used to calculate its absorption coefficient α, which is an important factor for determining the energy bandgaps for both direct and indirect allowed transitions, by using Tauc's relation ( 5), [35][36];…”

Section: Uv-vis Spectral Analysis and Optoelectronic Parametersmentioning

confidence: 99%

Structural, Linear and Nonlinear Optical Properties of Some Al-free and Al-doped ZnO Nanopowder Samples

Moussa

Ebrahim

Gomaa

et al. 2021

Preprint

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This research work aims to prepare and characterization some Al-doped ZnO nanoparticles. The co-precipitation method was used for preparing the desired samples, where ZnO replaced by AlCl3. Then the resulted materials were characterized and their structural phases identified using the XRD technique, where eight crystalline phases were identified and then assigned to some of the interatomic planes, (100), (002), (101), (102), (110), (103), (112), and (201). Both the average crystalline size and the micro-strain were calculated for each sample, where it was found that both of them increase when Ai-content increases. UV-vis spectra showed an absorption peak centered at 3.34 eV which represents the optical bandgap of ZnO. Al-Impurities acted to improve and increase the value of the optical transmittance, especially in the visible light region. The increase of Al-content influenced, where their values increase when AL-content increases. the value of the calculated nonlinear refractive index may be considered promising for different optoelectronic applications.

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“…The more interesting and distinct character of the borate glass and for which it was chosen is its two-building groups BO3 and BO4. The ratio BO3:BO4 is a guide tool related to the changes in the structural and physical properties of the borate glass [7][8][9][10][11][12][13][14][15]. The more interesting and distinct character of the borate glass and for which it was chosen is its two-building groups BO3 and BO4.…”

Section: Introductionmentioning

confidence: 99%