Iron coordination in silicate glasses

Bilan, O. N.; Gorbachev, S. M.; Cherenda, N.N.; Voropai, Y. S.; Yudin, D. M.

doi:10.1080/10420159108220574

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…This Fe 3+ band can be observed using luminescence spectroscopy, whereas in absorption it occurs in a spectral region where it is obscured by strong Fe 2+ bands. Previous studies indicated that this luminescence band occurs for tetrahedral Fe 3+ at 14 000-16 000 cm -1 and for octahedral Fe 3+ at 11 000-12 000 cm -1 [3,[38][39][40][41].…”

Section: Optical Absorption and Luminescencementioning

confidence: 98%

Novel structural behaviour of iron in alkali–alkaline-earth–silica glasses

Bingham

Parker

Searle

et al. 2002

Comptes Rendus. Chimie

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The combined effect of alkali and alkaline-earth ions on the redox, distribution, co-ordination and environment of Fe ions in alkali-alkaline-earth-silica glasses has been studied using a multi-technique approach. Wet chemical analysis and Mössbauer, electron spin resonance (ESR), optical absorption and photoluminescence spectroscopies were utilised. Behaviour generally falls into two categories, which we have termed 'collective' and 'selective'. Collective behaviour occurs when alkali and alkaline-earth ions have similar effects on a property and the overall effect is cumulative. This is characterised by a linear relationship with optical basicity of the glass. Some parameters associated with the environment of Fe 2+ ions fall into this category. Selective behaviour occurs when alkali and alkaline-earth ions have opposing effects on a property, suggesting competition or selectivity. This is characterised by a linear relationship with the alkali/alkaline-earth ionic radius ratio, cation field-strength ratio or oxide-basicity ratio. The Fe 2+ /ΣFe ratio and several parameters associated with the distribution, coordination and environment of Fe 3+ ions fall into this category. These results have implications for the local structure surrounding Fe species. A relationship has been suggested linking coordination and distribution of Fe 3+ ions. To cite this article: P.A. Bingham et al., C. R. Chimie 5 (2002) 787-796 © 2002 Académie des sciences / Éditions scientifiques et médicales Elsevier SAS silicate / glass / local structure / redox / iron Résumé -L'effet combiné des ions alcalins et alcalino-terreux sur le potentiel redox, l'environnement et la coordinance du fer a été étudié sur des verres de silicates par une approche combinant plusieurs techniques : chimie en solution, ESR, spectroscopies Mössbauer et optiques. Les résultats sont interprétés en termes de basicité optique et d'environnement du fer.

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Section: Optical Absorption and Luminescencementioning

confidence: 98%

Novel structural behaviour of iron in alkali–alkaline-earth–silica glasses

Bingham

Parker

Searle

et al. 2002

Comptes Rendus. Chimie

View full text Add to dashboard Cite

show abstract

“…The mixed coordination of Fe 3+ ions in glass has provoked extensive debate. There is broad agreement that tetrahedral and octahedral Fe 3+ ions may coexist in many silicate glasses, but with the majority of Fe 3+ ions being tetrahedrally coordinated [1,8,14,17,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Recent molecular dynamic simulations have also suggested the existence of five-coordinated Fe 3+ species [46], but the possible existence of such species in silicate glasses has received little support to date from spectroscopic data.…”

Section: Introductionmentioning

confidence: 97%

“…Luminescence studies of Fe 3+ ions in oxide glass systems have included volcanic aluminosilicates [26] sodium and calcium phosphates [16], borosilicates [27], sodium silicates [14], lithium silicates [28] and sodium and potassium aluminosilicates [17]. In these host materials, the 4 T 1 (G) !…”

Section: Introductionmentioning

confidence: 99%