The structure of GeO2–SiO2 glasses and melts: A Raman spectroscopy study

Henderson, Grant S.; Neuville, Daniel R.; Cochain, B.; Cormier, Laurent

doi:10.1016/j.jnoncrysol.2009.01.024

Cited by 159 publications

(122 citation statements)

References 56 publications

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“…Taking into account the results of the chemical analysis of the samples, it can be concluded that the fibers have a glass structure with an average composition intermediate between GeO 2 and SiO 2 . We find the Raman spectra for this type of glass in the literature recently [14,15], Raman spectra for SiO 2 and GeO 2 glasses are also well known. They present both a wide and intense band, respectively at 440 cm -1 and 416 cm -1 .…”

Section: Raman Micro-spectroscopy Analysissupporting

confidence: 58%

Elaboration of a Specific Class of Metamaterial: Glass in Single Crystal

Poumellec¹,

Lancry²,

Ani-Joseph³

et al. 2012

Crystallization and Materials Science of Modern Artificial and Natural Crystals

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Section: Raman Micro-spectroscopy Analysissupporting

confidence: 58%

Elaboration of a Specific Class of Metamaterial: Glass in Single Crystal

Poumellec¹,

Lancry²,

Ani-Joseph³

et al. 2012

Crystallization and Materials Science of Modern Artificial and Natural Crystals

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“…Taking into account the data in figure 4 and the above considerations, we can conclude that the GLPC optical proprieties are mainly affected by the local environment, within a sphere of radius of ~ 2 nm. Considering this structural effect, it is known that increasing the Ge doping content the Raman spectra of the silica change as a consequence of matrix modifications [21][22][23]. One of the Raman spectral features that can be used to investigate the Ge content effects on the silica glass matrix is the D1 band, peaked at about 490 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

Dependence of the emission properties of the germanium lone pair center on Ge doping of silica

Alessi

Agnello

Ouerdane

et al. 2010

J. Phys.: Condens. Matter

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Abstract. We present an experimental investigation regarding the changes induced by the Ge doping level on the emission profile of the Germanium Lone Pair Center (GLPC) in Ge doped silica. The investigated samples have been produced by the sol-gel method and by plasma activated chemical vapour deposition and have doping level up to 20 % by weight. The recorded photoluminescence spectra evidence that the GLPC emission profile is the same when the Ge content is lower than ~1 % by weight, whereas it changes for higher doping levels. We have also performed Raman scattering measurements that evidence the decrease of the D1 Raman band at 490 cm -1 when the Ge content is higher than 1 % by weight. The data suggest that both changes can be related to matrix modifications. These findings improve the knowledge regarding the matrix effects on the physical proprieties of the point defects and, in particular, for the GLPC they show that variations in their emission properties are induced by the presence of a second Ge atom close to the defect within a sphere with a radius of about 2 nm.

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“…There is a discussion in the literature that germania in comparison to silica will have different properties, in particular with respect to the formation of vitreous, i.e., glassy, phases [5][6][7]. Also, doping of germanium into silica or a mixed phase of both might lead to promising materials in a number of applications [8][9][10][11]. Given the detailed information derived from thin-film studies for silica, it is likely that one will be able to reveal the network structures for germania and germania-silica mixtures at the atomic level.…”

Section: Introductionmentioning

confidence: 99%

Atomic structure of a metal-supported two-dimensional germania film

et al. 2018

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The growth and microscopic characterization of two-dimensional germania films is presented. Germanium oxide monolayer films were grown on Ru(0001) by physical vapor deposition and subsequent annealing in oxygen. We obtain a comprehensive image of the germania film structure by combining intensity-voltage low-energy electron diffraction (I/V-LEED) and ab initio density functional theory (DFT) analysis with atomic-resolution scanning tunneling microscopy (STM) imaging. For benchmarking purposes, the bare Ru(0001) substrate and the (2 × 2)3O covered Ru(0001) were analyzed with I/V-LEED with respect to previous reports. STM topographic images of the germania film reveal a hexagonal network where the oxygen and germanium atom positions appear in different imaging contrasts. For quantitative LEED, the best agreement has been achieved with DFT structures where the germanium atoms are located preferentially on the top and fcc hollow sites of the Ru(0001) substrate. Moreover, in these atomically flat germania films, local site geometries, i.e., tetrahedral building blocks, ring structures, and domain boundaries, have been identified, indicating possible pathways towards two-dimensional amorphous networks.

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The structure of GeO2–SiO2 glasses and melts: A Raman spectroscopy study

Cited by 159 publications

References 56 publications

Elaboration of a Specific Class of Metamaterial: Glass in Single Crystal

Elaboration of a Specific Class of Metamaterial: Glass in Single Crystal

Dependence of the emission properties of the germanium lone pair center on Ge doping of silica

Atomic structure of a metal-supported two-dimensional germania film

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