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Issue 27, 2018
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Thermodynamic features and enthalpy relaxation in a metal–organic framework glass

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Abstract

In this work, we explore the thermodynamic evolution in a melt-quenched metal–organic framework glass, formed from ZIF-62 upon heating to the melting point (Tm), and subsequent enthalpy relaxation. The temperature dependence of the difference in Gibbs free energy between the liquid and crystal states of ZIF-62 in the temperature range from the glass transition temperature (Tg) to Tm is found to be weaker than those of other types of glasses, e.g., metallic glasses. Additionally, we find that the stretched exponent of the enthalpy relaxation function in the glass varies significantly (β = 0.44–0.76) upon changing the extent of sub-Tg annealing, compared to metallic and oxide glasses with similar Tgs, suggesting a high degree of structural heterogeneity. Pair distribution function results suggest no significant structural changes during the sub-Tg relaxation in ZIF-62 glass.

Graphical abstract: Thermodynamic features and enthalpy relaxation in a metal–organic framework glass

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Publication details

The article was received on 12 Apr 2018, accepted on 23 Jun 2018 and first published on 25 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP02340A
Citation: Phys. Chem. Chem. Phys., 2018,20, 18291-18296
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    Thermodynamic features and enthalpy relaxation in a metal–organic framework glass

    C. Zhou, M. Stepniewska, L. Longley, C. W. Ashling, P. A. Chater, D. A. Keen, T. D. Bennett and Y. Yue, Phys. Chem. Chem. Phys., 2018, 20, 18291
    DOI: 10.1039/C8CP02340A

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