Optical absorption near the fundamental absorption edge in some vanadate glasses

Hogarth, C. A.; Hosseini, Amirhossein

doi:10.1007/bf00547586

Cited by 53 publications

(24 citation statements)

References 5 publications

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“…The values of E calculated from the slope of the straight line of these curves are listed in Table 4. The values of E are calculated from the slopes of the straight lines of ln α versus (hω) plot, E was found to lie between 0.25 and 0.45 eV for the studied glass samples which are in agreement with the reported values (0.30-0.42 eV) for 5 mol% for different rare-earth oxides in 45 mol% V 2 O 5 -50 mol% P 2 O 5 [39]. As the values of E vary slightly with rare-earth type, a model based on electronic transitions between localized states is not preferable.…”

Section: Optical Absorption Spectra Of Rare Earths-doped Glasssupporting

confidence: 71%

IR and UV spectral studies for rare earths-doped tellurite glasses

El-Deen

Salhi

Elkholy

2008

Journal of Alloys and Compounds

137

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Section: Optical Absorption Spectra Of Rare Earths-doped Glasssupporting

confidence: 71%

IR and UV spectral studies for rare earths-doped tellurite glasses

El-Deen

Salhi

Elkholy

2008

Journal of Alloys and Compounds

137

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“…In these processes, the electrons are excited from a filled band to an empty band by the photon absorption and as a consequence of this, a marked increase in the absorption coefficient a(n) will result. The onset of this rapid change in a(n) is called the 'fundamental absorption edge' and the corresponding energy is defined as the 'energy gap' [9].…”

Section: Theorymentioning

confidence: 99%

Optical properties of samarium doped zinc–phosphate glasses

Eraiah

Bhat

2007

Journal of Physics and Chemistry of Solids

100

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Samarium doped zinc-phosphate glasses having composition Sm 2 O 3 (x) ZnO (60Àx) P 2 O 5 (40) (where x ¼ 0.1-0.5 mol%) were prepared by melt quenching method. The density of these glasses was measured by Archimedes method; the corresponding molar volumes have also been calculated. The values of density range from 3.34 to 3.87 gm/cm 3 and those of molar volume range from 27.62 to 31.80 cm À3. The optical absorbance studies were carried out on these glasses to measure their energy band gaps. The absorption spectra of these glasses were recorded in UV-visible region. No sharp edges were found in the optical spectra, which verifies the amorphous nature of these glasses. The optical band gap energies for these glasses were found to be in the range of 2.89-4.20 eV. The refractive index and polarizability of oxide ion have been calculated by using Lorentz-Lorentz relations. The values of refractive index range from 2.13 to 2.42 and those of polarizability of oxide ion range from 6.51 Â 10 À24 to 7.80 Â 10 À24 cm 3 .

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“…Hogarth and Hosseini [1] studied the optical absorption near the fundamental absorption edge in V2Os-PzOs and V2Os-PzOs-TeOz glasses. They found that the fundamental absorption of these glasses is dependent upon composition and arises from direct forbidden transitions and occurs at a photon energy in the range 1.9 to 2.6 eV, depending on composition.…”

Section: Introductionmentioning

confidence: 99%

Optical absorption spectra studies for amorphous Cu2O-Bi2O3 glass system

Elkholy

El-Badawy

El-Adawy

et al. 1995

J Mater Sci: Mater Electron

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Infrared absorption spectra were measured in the spectral range 4000-200 cm-1 for the Cu20-Bi=O3 glass system. Strong bands were observed around 436-477, 600-632, 700-715, 810-875, 975-1000, 1550-1610 and 3225-3510 crn -1 which are due to harmonics of the Bi-O-Bi stretching vibration, Cu-O stretching vibrations, O-Bi-O stretching vibrations, O-Bi-O bending vibrations, Bi-O stretching vibrations, free H=O normal-mode bending vibrations and free H20 molecules or OH-ions, respectively. Quantitative justification of these absorption bands shows that the values of the experimental wave number for most recorded absorption bands agree well with the theoretical ones.The optical absorption spectra were recorded for the same glass system in the spectral range 300-700 nm. These records show that the absorption edge has a tail extending towards lower energies. The edge shifts towards lower energies with increasing Cu20 content. This shift is mostly related to the structural rearrangement and the relative concentrations of the glass basic units. By increasing the Cu20 content, the optical energy gap decreases, while the width of the localized states increases.

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Optical absorption near the fundamental absorption edge in some vanadate glasses

Cited by 53 publications

References 5 publications

IR and UV spectral studies for rare earths-doped tellurite glasses

IR and UV spectral studies for rare earths-doped tellurite glasses

Optical properties of samarium doped zinc–phosphate glasses

Optical absorption spectra studies for amorphous Cu2O-Bi2O3 glass system

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