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Hybrid glasses from strong and fragile metal-organic framework liquids

DOI: 10.1038/ncomms9079 DOI Help
PMID: 26314784 PMID Help

Authors: Thomas Bennett (Department of Materials Science and Metallurgy, University of Cambridge) , Jin-chong Tan (University of Oxford) , Yuanzheng Yue (Aalborg University; Wuhan University of Technology) , Emma Baxter (University of Cambridge) , Caterina Ducati (University of Cambridge) , Nicholas Terrill (Diamond Light Source) , Hamish Yeung (NIMS) , Zhongfu Zhou (Aberystwyth University) , Wenlin Chen (Aberystwyth University) , Sebastian Henke (University of Cambridge) , Anthony K. Cheetham (University of Cambridge) , Neville Greaves (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 6

State: Published (Approved)
Published: August 2015
Diamond Proposal Number(s): 9691 , 5692

Open Access Open Access

Abstract: Hybrid glasses connect the emerging field of metal-organic frameworks (MOFs) with the glass formation, amorphization and melting processes of these chemically versatile systems. Though inorganic zeolites collapse around the glass transition and melt at higher temperatures, the relationship between amorphization and melting has so far not been investigated. Here we show how heating MOFs of zeolitic topology first results in a low density /`perfect/' glass, similar to those formed in ice, silicon and disaccharides. This order-order transition leads to a super-strong liquid of low fragility that dynamically controls collapse, before a subsequent order-disorder transition, which creates a more fragile high-density liquid. After crystallization to a dense phase, which can be remelted, subsequent quenching results in a bulk glass, virtually identical to the high-density phase. We provide evidence that the wide-ranging melting temperatures of zeolitic MOFs are related to their network topologies and opens up the possibility of /`melt-casting/' MOF glasses.

Journal Keywords: Chemical Sciences; Inorganic Chemistry; Materials Science

Subject Areas: Materials


Instruments: I15-Extreme Conditions , I22-Small angle scattering & Diffraction