In situ Raman spectroscopy of K2O-GeO2 melts

Королева, О. Н.; Осипов, А. А.

doi:10.1016/j.jnoncrysol.2019.119850

Cited by 15 publications

(12 citation statements)

References 30 publications

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“…For these reasons, it was necessary to identify the contributions of the individual vibrational modes by deconvolution, involving the fitting of Gaussian peaks in different frequency regions of the spectra. Such Gaussian deconvolution has been described in previous spectroscopic studies of germanate, borate, and borogermanate glasses 8,20,25,[30][31][32][33][34][35][36] .…”

Section: Resultsmentioning

confidence: 78%

“…Peak 3 could be assigned to the vibration of Ge-O -(Q 1 species) 31,33,34,37 . Peak 4 was assigned to symmetrical stretching vibrations of Ge-O-Ge bonds in 3-membered GeO4 rings 35,37 . Between 500 and 600 cm -1 , peaks 5 and 6 could be attributed to vibrations of Ge-O-Ge bonds in three-membered GeO4 and symmetrical vibrations of Ge-O-Ge [35][36][37] .…”

Section: Resultsmentioning

confidence: 99%

“…Peak 4 was assigned to symmetrical stretching vibrations of Ge-O-Ge bonds in 3-membered GeO4 rings 35,37 . Between 500 and 600 cm -1 , peaks 5 and 6 could be attributed to vibrations of Ge-O-Ge bonds in three-membered GeO4 and symmetrical vibrations of Ge-O-Ge [35][36][37] . The presence of only Ge 4+ in borogermanate glasses was recently elucidated using Ge K-edge EXAFS and XANES measurements 8,20 .…”

Section: Resultsmentioning

confidence: 99%

“…The first two (peaks 7 and 8) were assigned to the symmetrical stretching vibrations of metaborate chains and borate rings (di-triborate rings), respectively 32,34,37 . Previous investigations of germanate and borogermanate glasses using Raman spectroscopy found that the region between 800 and 900 cm -1 was dominated by vibrational modes of Q 2 and Q 3 units derived from the breakdown of tetrahedral [GeO4] units 31,32,[35][36][37] . Peaks 9 (815 cm -1 ) and 10 (828 cm -1 ) could be attributed to symmetrical stretching vibrations of Ge-Oin Q 2 and Q 3 species, respectively 36,38 .…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Franco

Ledemi

Correr

et al. 2021

Preprint

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New glass compositions containing high concentrations of Tb3+ ions were developed aiming at the production of magneto-optical (MO) fibers. This work reports on the structural and MO properties of a new glass composition based on (100-x)(41GeO2-25B2O3-4Al2O3-10Na2O-20BaO) – xTb4O7. Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb3+ ions confirmed the homogeneous distribution of Tb3+ ions and the absence of nanoclusters. All the samples presented excellent thermal stability against crystallization (ΔT > 100 oC). An optical fiber was manufactured by a fiber drawing process. The UV-Vis spectra of the glasses showed Tb3+ electronic transitions and optical windows varying from 0.4 to 1.6 µm. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments. The Verdet constant (VB) values were calculated at 500, 650, 880, 1050, 1330, and 1550 nm. The maximum VB values obtained at 650 and 1550 nm for the glass with x = 18 mol% were − 128 and − 17.6 rad T− 1 m− 1, respectively. The VB values at 500 and 1550 nm for the optical fiber containing 8 mol% of Tb4O7 were − 110.2 and − 9.5 rad T− 1 m− 1, respectively, while the optical loss at around 880 nm was 6.4 dB m− 1.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Franco

Ledemi

Correr

et al. 2021

Preprint

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show abstract

“…The band in the 670-700 cm −1 range came from asymmetrical stretching vibrations of Te-O-Te between [TeO 4 ]tbp and [TeO 3 ]tp/[TeO 3+1 ]units [59]. The band in the 730-750 cm −1 range was related to the stretching vibrations of the [TeO 3+1 ] units and TeO 3 2trigonal pyramids (tp's) with three terminal oxygen atoms [63] or symmetrical stretching vibrations of the Ge-Oof Ge (1) unit [64]. The band in the 780-800 cm −1 range was related to the stretching vibrations of Te-O − in [TeO 3 ]tp and [TeO 3+1 ] units and vibrations of the continuous [TeO 4 ]tbp network [65].…”

Section: Raman Spectramentioning

confidence: 99%

Investigation of the TeO2/GeO2 Ratio on the Spectroscopic Properties of Eu3+-Doped Oxide Glasses for Optical Fiber Application

et al. 2021

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This study presented an analysis of the TeO2/GeO2 molar ratio in an oxide glass system. A family of melt-quenched glasses with the range of 0–35 mol% of GeO2 has been characterized by using DSC, Raman, MIR, refractive index, PLE, PL spectra, and time-resolved spectral measurements. The increase in the content of germanium oxide caused an increase in the transition temperature but a decrease in the refractive index. The photoluminescence spectra of europium ions were examined under the excitation of 465 nm, corresponding to 7F0 → 5D2 transition. The PSB (phonon sidebands) analysis was carried out to determine the phonon energy of the glass hosts. It was reported that the red (5D0 → 7F2) to orange (5D0 → 7F1) fluorescence intensity ratio for Eu3+ ions decreased from 4.49 (Te0Ge) to 3.33 (Te15Ge) and showed a constant increase from 4.58 (Te20Ge) to 4.88 (Te35Ge). These optical features were explained in structural studies, especially changes in the coordination of [4]Ge to [6]Ge. The most extended lifetime was reported for the Eu3+ doped glass with the highest content of GeO2. This glass was successfully used for the drawing of optical fiber.

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Sources of Configurational Entropy versus Compositional Trends in Fragility of Inorganic Glass‐Forming Liquids

Sen

Chen

2022

Physica Status Solidi (b)

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The effect of the average network connectivity ⟨r⟩ on the configurational entropy S conf plays a key role in governing the compositional evolution of the fragility index m for chalcogenide, silicate, and phosphate glass‐forming liquids (GFLs). The effect of ⟨r⟩ on S conf, and thus on m in chalcogenide and phosphate GFLs can be explained using the self‐avoiding walk model for a chain of either chalcogen atoms (e.g., Se) or PO4 tetrahedra, with various degrees of cross‐linking. It is shown that while a disjointed chain is suitable for modeling the inverse relationship between m and ⟨r⟩ in chalcogenides, semiflexible chains with a higher degree of bending stiffness are more appropriate for modeling the phosphate liquids. In contrast, the silicate and aluminosilicate GFLs exhibit a fundamentally different pattern, which is indicative of S conf being controlled by the structural relaxation of a dynamically percolative network via the chemical exchange between bridging and non‐bridging oxygen. In contrast to silicates and phosphates, in the case of borate and germanate GFLs, the temperature dependence of the relative fractions of B or Ge atoms in multiple coordination states becomes the predominant contributor to the , which is consistent with their apparently anomalous trend of m increasing with ⟨r⟩.

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In situ Raman spectroscopy of K2O-GeO2 melts

Cited by 15 publications

References 30 publications

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Investigation of the TeO2/GeO2 Ratio on the Spectroscopic Properties of Eu3+-Doped Oxide Glasses for Optical Fiber Application

Sources of Configurational Entropy versus Compositional Trends in Fragility of Inorganic Glass‐Forming Liquids

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