Structure and properties of an amorphous metal--organic framework
| Autor: | 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. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Physical Review Letters 104, 115503 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.104.115503 |
| Popis: | 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. Comment: 4 pages, formatted for PRL |
| Databáze: | arXiv |
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