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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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Article information


Submitted
12 Apr 2018
Accepted
23 Jun 2018
First published
25 Jun 2018

Phys. Chem. Chem. Phys., 2018,20, 18291-18296
Article type
Paper

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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