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Instruments / Technical Area	Publication Details	Published	Actions
I15-Extreme Conditions I22-Small angle scattering & Diffraction	Hybrid glasses from strong and fragile metal-organic framework liquids Thomas Bennett , Jin-chong Tan , Yuanzheng Yue , Emma Baxter , Caterina Ducati , Nicholas Terrill , Hamish Yeung , Zhongfu Zhou , Wenlin Chen , Sebastian Henke , Anthony K. Cheetham , Neville Greaves Nature Communications 6 DOI: 10.1038/ncomms9079 PMID: 26314784 Diamond Proposal Number(s): [9691, 5692] Open Access Show Abstract ▼ 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.	Aug 2015

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I15-Extreme Conditions
I22-Small angle scattering & Diffraction

Hybrid glasses from strong and fragile metal-organic framework liquids