The structure of borate glasses studied by Raman scattering

Konijnendijk, W. L.; Stevels, J.M.

doi:10.1016/0022-3093(75)90137-4

Cited by 439 publications

(230 citation statements)

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“…47 Room-temperature Raman studies 48,49 of Cs borate glasses have shown that in the range 0.3ഛ x ഛ 0.5 the negative charge is located mainly on the metaborate species, i.e., on tetrahedra BØ 4 − and BØ 2 O − triangles, the latter being organized mostly into metaborate rings B 3 O 6 3− , through the following equilibrium reaction: 2 2− exist in considerable concentrations at high Cs 2 O contents and temperatures, we search now for the possibility of these SRO units being organized into well-defined medium-range-order ͑MRO͒ structures like ring and dimer types expressed by reactions ͑8͒ and ͑9͒, respectively. For this purpose, we have counted all possible structural configurations of two interconnected borate triangular units, with at least one of them being charged.…”

Section: -4mentioning

confidence: 99%

“…Early studies on borate glasses aimed at elucidating the nature and relative population of the borate units comprising the glass network as a means of providing a structural basis for explaining the boron anomaly effect. 1 The works of Krogh-Moe by infrared, 2 Bray and co-workers by NMR, [3][4][5] and Konijnendijk and Stevels by Raman spectroscopy 6 have made pioneering contributions in this field. While glassy B 2 O 3 is known to result from interconnected BØ 3 triangles ͑Ø denotes an oxygen atom bridging two boron centers͒, a fraction of which is being arranged in planar boroxol rings, 2-8 addition of metal oxide to boron oxide was found to cause the transformation of neutral BØ 3 units into charged BØ 4 − tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

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Composition and temperature dependence of cesium-borate glasses by molecular dynamics

Vegiri

Varsamis

Kamitsos

2005

The Journal of Chemical Physics

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The structural aspects of xCs 2 O-͑1−x͒B 2 O 3 glasses have been investigated by molecular dynamics as functions of Cs 2 O content ͑x = 0.2, 0.3, and 0.4͒ and temperature ͑T = 300 and 1250 K͒. The tetrahedral ͑BØ 4 − ͒ and triangular ͑BØ 3 ,BØ 2 O − , and BØO 2 2− ͒ short-range order borate units were found to be the structure-building entities of the simulated glasses ͓Ø=bridging oxygen ͑BO͒ and O − =nonbridging oxygen ͑NBO͒ atom͔. The increase of Cs 2 O content results in the progressive increase of the NBO-containing triangle population at the expense of the BØ 4 − tetrahedral units. The same effect is caused by temperature increase at a fixed Cs 2 O content, and this was associated with the "fragile" characteristics of alkali borate glasses. A comparison of simulated Cs and Li borates showed very similar structures at x = 0.2, but dissimilar ones when the alkali content exceeds this composition. In particular, for x Ͼ 0.2 Cs borates exhibit a preference for NBO formation relative to Li borates. Differences in the microstructure of sites hosting Cs ions were found, and this permits their classification into bridging ͑b type͒ and nonbridging type ͑nb type͒ of sites. b-type sites consist exclusively of BO atoms, while both BO and NBO atoms participate in nb-type sites. These differences in Cs-site local bonding characteristics were found to be reflected on the Cs-O͑site͒ vibration frequencies. Also, the computed Cs-O vibrational responses for simulated Cs borates were found to compare well with experimental far-infrared spectra.

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Section: -4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Composition and temperature dependence of cesium-borate glasses by molecular dynamics

Vegiri

Varsamis

Kamitsos

2005

The Journal of Chemical Physics

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“…The band situated at 764cm -1 has been attributed to the symmetrical breathing vibrations of six-member borate rings with one or two BO 4 tetrahedra [13]. The band at 950cm -1 is assigned to vibrations of diborate groups and 1150cm -1 is assigned to vibrations of pyro-borate groups [16] and the band 1304cm -1 is assigned to B-O -vibrations from various borate groups the presence in our Raman spectra of the band at 1443cm -1 assigned to vibrations of the chain type metaborate units [18].…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

Kumar

Edukondalu

Muralimohan

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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IntroductionThe interest in heavy metal oxide glasses is due to their long infrared cut-off and optical non-linearity [1]. Bismuth based oxide glasses have attracted the attention of scientific community, due to their important applications in the field of glass ceramics, thermal and mechanical sensors etc. a survey of literature shows that there are many reports available on quaternary bismuth borate glasses [2,3]. The present work is focused on studying the effect of Bi 2 O 3 and Li 2 O on cadmium borate quaternary glass system. The presence of the two glass formers Bi 2 O 3 and B 2 O 3 increases the interest in present study.

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“…Generally it is assumed that increasing the concentration of B [3] and minimizing B [4] units causes an decreasingly cross-linked network, a Ga 2 O 3 :Na 2 O of ≥ 6:4 resulted in a plateau and subsequent reduction in the release half-life and ion release levels at 720 h, for B, Sr, and Ga [13,14,51]. This is consistent with our hypothesis, that above this ratio the increased removal of Na is counteracted by the stabilizing role of GaO 4 tetrahedra within the network, which contributes to the continuing decline of the relative population of B [4] structural units.…”

Section: Discussionmentioning

confidence: 99%

High Borate Networks as a Platform to Modulate Temporal Release of Therapeutic Metal Ions Gallium and Strontium

O'Connell¹,

Werner‐Zwanziger²,

O’Shea³

et al. 2017

Biomedical Glasses

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Abstract:The effect of increasing substitutions of Ga 2 O 3 :Na 2 O on the structure and contingent properties, of six quaternary high borate glasses was evaluated. Component ion release and particularly gallium ion release was studied post extraction, under simulated physiological conditions. Increasing substitutions of Ga 2 O 3 :Na 2 O (i.e. 0:1 -6:4) resulted in destabilization of the glass network, observed by increases in component ion release and half-life of release. However, at ≥ 6:4 Ga 2 O 3 :Na 2 O ratio, network stabilization appeared to occur, resulting in a decrease in ion release half-life and total ion release for B, Sr, and Ga at 720 h of extraction. A linear release profile for strontium was provided by each glass composition, and for gallium by composition GB202 (70B

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The structure of borate glasses studied by Raman scattering

Cited by 439 publications

References 10 publications

Composition and temperature dependence of cesium-borate glasses by molecular dynamics

Composition and temperature dependence of cesium-borate glasses by molecular dynamics

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

High Borate Networks as a Platform to Modulate Temporal Release of Therapeutic Metal Ions Gallium and Strontium

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The structure of borate glasses studied by Raman scattering

Cited by 439 publications

References 10 publications

Composition and temperature dependence of cesium-borate glasses by molecular dynamics

Composition and temperature dependence of cesium-borate glasses by molecular dynamics

Spectroscopic studies of xLi2O-(40-x)Bi2O3-20CdO-40B2O3 Glasses

High Borate Networks as a Platform to Modulate Temporal Release of Therapeutic Metal Ions Gallium and Strontium

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Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses