Free volume anomalies in mixed-cation glasses revealed by positron annihilation lifetime spectroscopy (PALS)

Malcolm D. Ingram; Steven J. Pas; Cornelia Cramer; Yong Gao; Anita J. Hill

doi:10.1039/b419201j

Free volume anomalies in mixed-cation glasses revealed by positron annihilation lifetime spectroscopy (PALS)

Malcolm D. Ingram, Steven J. Pas, Cornelia Cramer, Yong Gao, Anita J. Hill

Chemistry

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Abstract

PALS experiments reveal a minimum in ortho-positronium (o-Ps) lifetimes and a maximum in the corresponding intensities that emerge when mixed-cation (Li/Na) borate glasses are heated from ambient temperatures up to 473 K. These free volume 'anomalies' appear to be a true manifestation of the mixed alkali effect (MAE). They are consistent with a mechanism of ion transport involving cooperation between hops of unlike cations, resulting in increased disturbance of the glass network. The result lends support to the dynamic structure model.

Original language	English
Pages (from-to)	1620-1623
Number of pages	4
Journal	Physical Chemistry Chemical Physics
Volume	7
Issue number	8
Early online date	15 Mar 2005
DOIs	https://doi.org/10.1039/b419201j
Publication status	Published - Mar 2005

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abstract = "PALS experiments reveal a minimum in ortho-positronium (o-Ps) lifetimes and a maximum in the corresponding intensities that emerge when mixed-cation (Li/Na) borate glasses are heated from ambient temperatures up to 473 K. These free volume 'anomalies' appear to be a true manifestation of the mixed alkali effect (MAE). They are consistent with a mechanism of ion transport involving cooperation between hops of unlike cations, resulting in increased disturbance of the glass network. The result lends support to the dynamic structure model.",

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AU - Gao, Yong

AU - Hill, Anita J.

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N2 - PALS experiments reveal a minimum in ortho-positronium (o-Ps) lifetimes and a maximum in the corresponding intensities that emerge when mixed-cation (Li/Na) borate glasses are heated from ambient temperatures up to 473 K. These free volume 'anomalies' appear to be a true manifestation of the mixed alkali effect (MAE). They are consistent with a mechanism of ion transport involving cooperation between hops of unlike cations, resulting in increased disturbance of the glass network. The result lends support to the dynamic structure model.

AB - PALS experiments reveal a minimum in ortho-positronium (o-Ps) lifetimes and a maximum in the corresponding intensities that emerge when mixed-cation (Li/Na) borate glasses are heated from ambient temperatures up to 473 K. These free volume 'anomalies' appear to be a true manifestation of the mixed alkali effect (MAE). They are consistent with a mechanism of ion transport involving cooperation between hops of unlike cations, resulting in increased disturbance of the glass network. The result lends support to the dynamic structure model.

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DO - 10.1039/b419201j

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JO - Physical Chemistry Chemical Physics

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Free volume anomalies in mixed-cation glasses revealed by positron annihilation lifetime spectroscopy (PALS)

Abstract

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