Urbach's Rule in Undoped and Co Doped (80-x)Sb2O3-20Na2O-xWO3Glasses

Petkova, P.; Soltani, Mohamed Toufik; Petkov, S.; Nedkov, V.

doi:10.12693/aphyspola.121.152

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…The doping with cobalt ions creates colour centres (blue, pink or red), its colour changes with the transformation of its tetrahedral coordination to octahedral for a change in melt composition with absorption bands in the visible and NIR regions. [10][11] . On the other hand, cobalt ion exists in mixed valence octahedral and tetrahedral sites which, make it a promising modifier for many applications such as solar selective absorbers, fuel cells, and visible and near-infrared laser materials [6][7] .…”

Section: Introductionmentioning

confidence: 99%

Influence of the addition of Two Transition Metal Ions to Sodium Zinc Borophosphate Glasses for Optical Applications

et al. 2021

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Effect of Co and Mo ions on the sodium zinc borophosphate glasses network was investigated. Both structural and optical properties were studied by X-ray diffraction, density, infrared spectroscopy and optical absorption. Only a broad halo was observed in the X-ray diffraction patterns indicating the non-crystalline nature of the prepared samples. Density and related parameters such as molar volume and average boron-boron separation showed that the glass network became more compact by increasing Mo oxide. Fourier Transform Infrared (FTIR) spectroscopy results showed that the free Co and Mo sample revealed the formation of structural building units of the borate and phosphate glasses. The addition of Co and Mo oxides cause variation in structural sites of the glass formers which appear as a small change in the FTIR spectra. The optical absorption spectra in the UV-Visible regions were used to study the optical d-d transitions of Co and Mo ions. Deconvolution of the absorption spectra gave multi-bands in the UV-Visible regions which, are related to the presence of various oxidation states of the two transition metal ions, cobalt and molybdenum, octahedral and tetrahedral of Co 2+ , octahedral of Co 3+ , Mo 3+ , and Mo 5+ . The calculated optical energy gap, Urbach energy and refractive index of all the prepared samples were found to be glass composition dependent.

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Section: Introductionmentioning

confidence: 99%

Influence of the addition of Two Transition Metal Ions to Sodium Zinc Borophosphate Glasses for Optical Applications

et al. 2021

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“…Sb2O3 glasses emerge as a major family of heavy metal oxide (HMO) glasses [1][2][3][4] and they have potential applications in nonlinear optical devices such as ultra-fast optical switches, power limiters and broad band optical amplifiers. The glasses and glass ceramics containing cupreous ions are considered to be useful for nonlinear optical absorbers needed for passive modulations of laser beam and for Q-switching devices [5][6].…”

Section: Introductionmentioning

confidence: 99%

Infrared spectroscopy of undoped and Cu-doped (80-x)Sb2O3-20Li2O-xMoO3 glasses

Petkova¹,

Boubaker²,

Vasilev³

et al. 2016

AIP Conference Proceedings

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“…It became obvious that Sb 2 O 3 glasses are one of the major classes of heavy metal oxide glasses [1,2] and appear to be easily applicable in non-linear optical devices like optical amplifiers and lasers. These glasses have low energy of photons and high refractive index.…”

Section: Introductionmentioning

confidence: 99%