| Title: |
Structure and properties of an amorphous metal--organic framework |
| Authors: |
Bennett, Thomas D.; Goodwin, Andrew L.; Dove, Martin T.; Keen, David A.; Tucker, Matthew G.; Barney, Emma R.; Soper, Alan K.; Bithell, Erica G.; Tan, Jin-Chong; Cheetham, Anthony K. |
| Publication Year: |
2010 |
| Collection: |
ArXiv.org (Cornell University Library) |
| Subject Terms: |
Materials Science |
| Description: |
We show that ZIF-4, a metal-organic framework (MOF) with a zeolitic structure, undergoes a crystal--amorphous transition on heating to 300 $^\circ$C. The amorphous form, which we term a-ZIF, is recoverable to ambient conditions or may be converted to a dense crystalline phase of the same composition by heating to 400 $^\circ$C. Neutron and X-ray total scattering data collected during the amorphization process are used as a basis for reverse Monte Carlo refinement of an atomistic model of the structure of a-ZIF. We show that the structure is best understood in terms of a continuous random network analogous to that of a-SiO$_2$. Optical microscopy, electron diffraction and nanoindentation measurements reveal a-ZIF to be an isotropic glass-like phase capable of plastic flow on its formation. Our results suggest an avenue for designing broad new families of amorphous and glass-like materials that exploit the chemical and structural diversity of MOFs. ; 4 pages, formatted for PRL |
| Document Type: |
text |
| Language: |
unknown |
| Relation: |
http://arxiv.org/abs/1001.1332; Physical Review Letters 104, 115503 (2010) |
| DOI: |
10.1103/PhysRevLett.104.115503 |
| Availability: |
http://arxiv.org/abs/1001.1332; https://doi.org/10.1103/PhysRevLett.104.115503 |
| Accession Number: |
edsbas.CBBD6044 |
| Database: |
BASE |