Graphitization of Glassy Carbon after Compression at Room Temperature
| Autor: | Jodie Bradby, C. de Tomas, Irene Suarez-Martinez, Thomas B. Shiell, Dougal G. McCulloch, Matthew R. Field, Nigel A. Marks, David R. McKenzie, Reinhard Boehler, Brenton A. Cook, Bianca Haberl |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Isotropy General Physics and Astronomy Thermodynamics 02 engineering and technology Glassy carbon 021001 nanoscience & nanotechnology 01 natural sciences Orientation (vector space) Amorphous carbon Phase (matter) 0103 physical sciences Graphite Deformation (engineering) 010306 general physics 0210 nano-technology Spectroscopy |
| Zdroj: | Physical Review Letters. 120 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.120.215701 |
| Popis: | Glassy carbon is a technologically important material with isotropic properties that is nongraphitizing up to $\ensuremath{\sim}3000\text{ }\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ and displays complete or ``superelastic'' recovery from large compression. The pressure limit of these properties is not yet known. Here we use experiments and modeling to show permanent densification, and preferred orientation occurs in glassy carbon loaded to 45 GPa and above, where 45 GPa represents the limit to the superelastic and nongraphitizing properties of the material. The changes are explained by a transformation from its $s{p}^{2}$ rich starting structure to a $s{p}^{3}$ rich phase that reverts to fully $s{p}^{2}$ bonded oriented graphite during pressure release. |
| Databáze: | OpenAIRE |
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