Network former mixing (NFM) effects in alkali germanotellurite glasses

Bradtmüller, Henrik; Rodrigues, Ana Cândida Martins; Eckert, Hellmut

doi:10.1016/j.jallcom.2021.159835

Cited by 5 publications

(5 citation statements)

References 48 publications

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“…At high content of modifiers, a less connected network is formed predominated by [TeO 3 ] units. 21,61–67 In turn, the phosphate glass network may be composed of up to four different types of [PO n ] polyhedra. In mixed network former systems, these are denominated by the P n m x terminology, where n is the number of bridging O atoms connecting to other network formers while m denotes the number of these linkages connecting the phosphate polyhedron with the specific network former species X; 68 this reference also states the relationship to the Q n terminology used for single-network former phosphate glasses.…”

Section: Resultsmentioning

confidence: 99%

“…In general, in tellurite glasses the glass network is mainly formed by three distinct types of [TeO n ] polyhedra, whose quantitative distribution depends on the network modifier content. [61][62][63][64][65][66][67] Glasses with high TeO 2 contents are mainly composed of highly connected pseudo-trigonal bipyramidal [TeO 4 ] units. The addition of glass modifier compounds usually leads to the conversion of [TeO 4 ] to [TeO 3+1 ] units, in which one of the axial Te-O linkages is elongated.…”

Section: Also Lists the Various Glassmentioning

confidence: 99%

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Structural characterization of a new fluorophosphotellurite glass system

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Section: Also Lists the Various Glassmentioning

confidence: 99%

Structural characterization of a new fluorophosphotellurite glass system

et al. 2023

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“…Depending on the M/Ga cation ratio (where M is alkali metal or alkaline earth metals), gallium cations tend to balance the charges, forming four- or six-fold coordination units. Moreover, the Raman spectra of the gallo-germanate glasses show that four different structures describe the network of this glass (Q n , where n = 0, 1, 2, and 3, which corresponds to the number of bridging oxygen) [ 2 , 5 , 13 , 30 , 31 , 32 ]. This study discusses the glass network related to the IR and Raman spectra of glasses based on the network model mentioned above.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Fluorides (BaF2, MgF2, AlF3) on Structural and Luminescent Properties of Er3+-Doped Gallo-Germanate Glass

et al. 2022

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The effect of BaF2, MgF2, and AlF3 on the structural and luminescent properties of gallo-germanate glass (BGG) doped with erbium ions was investigated. A detailed analysis of infrared and Raman spectra shows that the local environment of erbium ions in the glass was influenced mainly by [GeO]4 and [GeO]6 units. Moreover, the highest number of non-bridging oxygens was found in the network of the BGG glass modified by MgF2. The 27Al MAS NMR spectrum of BGG glass with AlF3 suggests the presence of aluminum in tetra-, penta-, and octahedral coordination geometry. Therefore, the probability of the 4I13/2→4I15/2 transition of Er3+ ions increases in the BGG + MgF2 glass system. On the other hand, the luminescence spectra showed that the fluoride modifiers lead to an enhancement in the emission of each analyzed transition when different excitation sources are employed (808 nm and 980 nm). The analysis of energy transfer mechanisms shows that the fluoride compounds promote the emission intensity in different channels. These results represent a strong base for designing glasses with unique luminescent properties.

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“…Several studies on the structure of tellurite, germanate, and tellurite-germanate glasses with various spectroscopy techniques have been performed, such as IR, Raman, and solid-state nuclear magnetic resonance (MAS NMR) spectroscopy [ 37 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ]. The network of pure tellurite glasses can be formed by [TeO 4 ] trigonal bipyramidal (btp), [TeO 3 ] trigonal pyramidal (tp), and [TeO 3+1 ] intermediate units.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies on the structure of tellurite, germanate, and tellurite-germanate glasses with various spectroscopy techniques have been performed, such as IR, Raman, and solidstate nuclear magnetic resonance (MAS NMR) spectroscopy [37,[43][44][45][46][47][48][49][50][51][52] To investigate the effect of composition variation on the structure of glass, and the local environment around Eu 3+ ions, the MIR, and Raman spectra studies of glasses have been investigated.…”

Section: Structural Studiesmentioning

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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Network former mixing (NFM) effects in alkali germanotellurite glasses

Cited by 5 publications

References 48 publications

Structural characterization of a new fluorophosphotellurite glass system

Structural characterization of a new fluorophosphotellurite glass system

The Effect of Fluorides (BaF2, MgF2, AlF3) on Structural and Luminescent Properties of Er3+-Doped Gallo-Germanate Glass

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

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