Evidence from infrared spectroscopy of structural relaxation during field assisted and chemically driven ion exchange in soda-lime-silica glasses

M. D. Ingram, M.-H. Wu, A. Coats, E. I. Kamitsos, C. -P. E. Varsamis, N. Garcia, M. Sola

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Abstract

Evidence is provided by infrared reflectance spectroscopy of structural relaxation occurring in ion exchanged surface layers in commercial soda-lime-silica glasses. Monovalent cations (K+, Ag+ and Li+) are introduced from molten nitrate baths both by simple diffusion and with the assistance of externally applied electric fields. In the case of K+ ions, a highly resistive layer is created and is characterised by impedance spectroscopy. The mid infrared spectra provide information on changes in the silicate network: they show that the introduction of Li+ and Ag+ leads to a disproportionation reaction with conversion of Q(3) into Q(2) and Q(4) species. In contrast, the introduction of K+ ions leads to the opposite (i.e. comproportionation) reaction, where Q(2) and Q(4) are converted into Q(3) units. These processes are chemically driven; they are impeded, e.g. by the build up of internal pressures accompanying the introduction of the larger K+ ion. The results provide direct evidence for cation-induced relaxations in the glass network (CAIRON).

Original languageEnglish
Pages (from-to)84-89
Number of pages6
JournalPhysics and Chemistry of Glasses
Volume46
Issue number2
Publication statusPublished - Apr 2005

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Evidence from infrared spectroscopy of structural relaxation during field assisted and chemically driven ion exchange in soda-lime-silica glasses. / Ingram, M. D.; Wu, M.-H.; Coats, A.; Kamitsos, E. I.; Varsamis, C. -P. E.; Garcia, N.; Sola, M.

In: Physics and Chemistry of Glasses, Vol. 46, No. 2, 04.2005, p. 84-89.

Research output: Contribution to journalArticle

Ingram, M. D. ; Wu, M.-H. ; Coats, A. ; Kamitsos, E. I. ; Varsamis, C. -P. E. ; Garcia, N. ; Sola, M. / Evidence from infrared spectroscopy of structural relaxation during field assisted and chemically driven ion exchange in soda-lime-silica glasses. In: Physics and Chemistry of Glasses. 2005 ; Vol. 46, No. 2. pp. 84-89.
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abstract = "Evidence is provided by infrared reflectance spectroscopy of structural relaxation occurring in ion exchanged surface layers in commercial soda-lime-silica glasses. Monovalent cations (K+, Ag+ and Li+) are introduced from molten nitrate baths both by simple diffusion and with the assistance of externally applied electric fields. In the case of K+ ions, a highly resistive layer is created and is characterised by impedance spectroscopy. The mid infrared spectra provide information on changes in the silicate network: they show that the introduction of Li+ and Ag+ leads to a disproportionation reaction with conversion of Q(3) into Q(2) and Q(4) species. In contrast, the introduction of K+ ions leads to the opposite (i.e. comproportionation) reaction, where Q(2) and Q(4) are converted into Q(3) units. These processes are chemically driven; they are impeded, e.g. by the build up of internal pressures accompanying the introduction of the larger K+ ion. The results provide direct evidence for cation-induced relaxations in the glass network (CAIRON).",
author = "Ingram, {M. D.} and M.-H. Wu and A. Coats and Kamitsos, {E. I.} and Varsamis, {C. -P. E.} and N. Garcia and M. Sola",
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AU - Ingram, M. D.

AU - Wu, M.-H.

AU - Coats, A.

AU - Kamitsos, E. I.

AU - Varsamis, C. -P. E.

AU - Garcia, N.

AU - Sola, M.

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N2 - Evidence is provided by infrared reflectance spectroscopy of structural relaxation occurring in ion exchanged surface layers in commercial soda-lime-silica glasses. Monovalent cations (K+, Ag+ and Li+) are introduced from molten nitrate baths both by simple diffusion and with the assistance of externally applied electric fields. In the case of K+ ions, a highly resistive layer is created and is characterised by impedance spectroscopy. The mid infrared spectra provide information on changes in the silicate network: they show that the introduction of Li+ and Ag+ leads to a disproportionation reaction with conversion of Q(3) into Q(2) and Q(4) species. In contrast, the introduction of K+ ions leads to the opposite (i.e. comproportionation) reaction, where Q(2) and Q(4) are converted into Q(3) units. These processes are chemically driven; they are impeded, e.g. by the build up of internal pressures accompanying the introduction of the larger K+ ion. The results provide direct evidence for cation-induced relaxations in the glass network (CAIRON).

AB - Evidence is provided by infrared reflectance spectroscopy of structural relaxation occurring in ion exchanged surface layers in commercial soda-lime-silica glasses. Monovalent cations (K+, Ag+ and Li+) are introduced from molten nitrate baths both by simple diffusion and with the assistance of externally applied electric fields. In the case of K+ ions, a highly resistive layer is created and is characterised by impedance spectroscopy. The mid infrared spectra provide information on changes in the silicate network: they show that the introduction of Li+ and Ag+ leads to a disproportionation reaction with conversion of Q(3) into Q(2) and Q(4) species. In contrast, the introduction of K+ ions leads to the opposite (i.e. comproportionation) reaction, where Q(2) and Q(4) are converted into Q(3) units. These processes are chemically driven; they are impeded, e.g. by the build up of internal pressures accompanying the introduction of the larger K+ ion. The results provide direct evidence for cation-induced relaxations in the glass network (CAIRON).

M3 - Article

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EP - 89

JO - Physics and Chemistry of Glasses

JF - Physics and Chemistry of Glasses

SN - 0031-9090

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ER -