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Abstrakt

Metal-organic framework glasses feature unique thermal, structural, and chemical properties compared to traditional metallic, organic, and oxide glasses. So far, there is a lack of knowledge of their mechanical properties, especially toughness and strength, owing to the challenge in preparing large bulk glass samples for mechanical testing. However, a recently developed melting method enables fabrication of large bulk glass samples (>25 mm3) from zeolitic imidazolate frameworks. Here, fracture toughness (KIc) of a representative glass, namely ZIF-62 glass (Zn(C3H3N2)1.75(C7H5N2)0.25), is measured using single-edge precracked beam method and simulated using reactive molecular dynamics. KIc is determined to be ~0.1 MPa m0.5, which is even lower than that of brittle oxide glasses due to the preferential breakage of the weak coordinative bonds (Zn-N). The glass is found to exhibit an anomalous brittle-to-ductile transition behavior, considering its low fracture surface energy despite similar Poisson’s ratio to that of many ductile metallic and organic glasses.

OriginalsprogEngelsk
Artikelnummer2593
TidsskriftNature Communications
Vol/bind11
Antal sider9
ISSN2041-1723
DOI
StatusUdgivet - 22 maj 2020

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  • Projekter

    • 1 Igangværende

    Glass Mechanical Properties: Structural Origins and Engineering

    Smedskjær, M. M., Yue, Y., Somers, M. A. J., Januchta, K. & To, T.

    01/10/201628/02/2021

    Projekter: ProjektForskning

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