Hybrid glasses from strong and fragile metal-organic framework liquids

Research output: Contribution to journalArticlepeer-review

Authors

  • Thomas D. Bennett
  • Jin-chong Tan
  • Yuanzheng Yue
  • Emma Baxter
  • Caterina Ducati
  • Nick J. Terrill
  • Zhongfu Zhou
  • Wenlin Chen
  • Sebastian Henke
  • Anthony K. Cheetham
  • G. Neville Greaves

Colleges, School and Institutes

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.

Details

Original languageEnglish
Article number8079
JournalNature Communications
Volume6
Issue number1
Publication statusPublished - 28 Aug 2015