The intrinsic role of network modifiers (Ca versus Mg) in the reaction kinetics and microstructure of sodium silicate-activated CaO-MgO-Al2O3-SiO2 glasses

Hamdan, Abdelrahman; Hajimohammadi, Ailar; Rawal, Aditya; Kim, Tae‐Hwan

doi:10.1016/j.cemconres.2022.107058

Cited by 16 publications

(1 citation statement)

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“…The bridging oxygen (BO) units connecting the dopants with the silica phosphate tetrahedra may imbue into depolymerized linkages. These depolymerized sections of moieties are strengthened by nonbridging oxygens (NBOs), aided with the addition of modifier oxides such as CaO and Pr 2 O 3 [17,18]. In order to suppress the likely crystalline phases of CaO with P 2 O 5 , the molar concentration of CaO was fixed at the lowest 3.5 mol%, while the effect of Pr 3+ was studied over varying concentrations from 0 to 1.5 mol%.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Gracie

Geetha²,

Battisha³

2023

J. Phys. D: Appl. Phys.

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Silica phosphate glasses strengthened with calcium oxide modifier and doped with different concentrations (0%, 0.5%, 1%, 1.5 mol%) of praseodymium (Pr3+) were synthesized by sol-gel method. The absence of sharp peaks in the x-ray diffraction (XRD) spectra confirms non-crystallinity of the glasses. Higher doping indicates increasing optical band gaps due to Burstein Moss shift, which also reflects on structural disorders at the absorption tails as validated by Urbach’s rule. The density increases with a subsequent decrease in oxygen packing density, proving the mechanical and chemical stability of the glasses. The composite glasses are multifunctional with marked absorption at 280 nm predicting its purpose as UV shielding films. Luminescence corresponding to the intra 4f transition, 〖1_D〗_2→〖1_G〗_4 in the IR region, with high transmission and low reflection losses suggests the use of the synthesized glass material for S-band telecommunications, while the radiative process involving 〖3_P〗_0→〖3_F〗_2 yields a predominant red laser source. Commission International de l’Eclairage (CIE) color coordinates observe warmer red emission corresponding to Correlated Colour Temperature (CCT) of 3200 K. The composite silica phosphate glass systems evidence the effective role of Pr3+ for photonic applications.

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Section: Introductionmentioning

confidence: 99%