Influence of graphene nanopowder impurities on the structural and optical properties of sodium borate copper-based glass: Towards UV/NIR shielding materials

Gomaa, Hosam M.; Saudi, H. A.; Yahia, I.S.; Zahran, H. Y.

doi:10.1016/j.solidstatesciences.2022.106911

Cited by 2 publications

(2 citation statements)

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“…If an alkali oxide is introduced into silica glass, the added oxygen ion contributes to the stacking of the oxygen ions, while the cations fill the empty spaces. As a result, the total space filled becomes larger and the density increases [1]- [3] as opposed to alkali borate types of glass where their density decreases as modifiers are added [22]- [23].…”

Section: Theoretical Calculations Of Propertiesmentioning

confidence: 99%

“…Although types of glass containing the usual network modifiers are usually completely colorless in the visible region of the spectrum, this is not the case if they also contain elements from the transition metals; Cu, Ti, V, Cr, Mn, Fe, Co and Ni being the most important [1]- [3]. Regarding these elements, the excited state of electrons changes as a result of the absorption of electromagnetic radiation, even when exposed to low-energy light, so coloration of the glass in the visible range occurs.…”

Section: Introductionmentioning

confidence: 99%

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Annealing Effect on Copper-Doped Sodium Borate Glasses (Na2O.4B2O3)

Aboutaleb¹,

Safi²

2023

Hung. J. Ind. Chem.

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The annealing effect of an alkali borate type glass below its softening point was investigated according to the Na2O-B2O3 binary system. The samples were doped by introducing different amounts of copper oxide (CuO). The properties of elaborate glasses before and after annealing were studied. X-ray diffraction (XRD) as well as optical and infrared spectroscopy were used in this study. The results obtained show that annealing, that is, a heat treatment process, affects the structure of this type of glass by redistributing its structural units and partially correcting any defects, thereby reinforcing the structure. It was noticed that the BO3 units were reformed while the number of BO4 ones decreased, leading to an increase in the coefficient of thermal expansion, a decrease in both the refractive index and optical dispersion, the weakening of mechanical properties as well as a reduction in thermal conductivity and electric permittivity.

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