Nano-cracks in a synthetic graphite composite for nuclear applications
| Autor: | Dong Liu, David Cherns |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Amorphous solid Lattice constant Transmission electron microscopy Nuclear graphite 0103 physical sciences Scanning transmission electron microscopy Graphite Selected area diffraction Composite material 0210 nano-technology Single crystal |
| Zdroj: | Philosophical Magazine. 98:1272-1283 |
| ISSN: | 1478-6443 1478-6435 |
| DOI: | 10.1080/14786435.2018.1433886 |
| Popis: | Mrozowski nano-cracks in nuclear graphite were studied by transmission electron microscopy and selected area diffraction. The material consisted of single crystal platelets typically 1–2 nm thick and stacked with large relative rotations around the c-axis; individual platelets had both hexagonal and cubic stacking order. The lattice spacing of the (0002) planes was about 3% larger at the platelet boundaries which were the source of a high fraction of the nano-cracks. Tilting experiments demonstrated that these cracks were empty, and not, as often suggested, filled by amorphous material. In addition to conventional Mrozowski cracks, a new type of nano-crack is reported, which originates from the termination of a graphite platelet due to crystallographic requirements. Both types are crucial to understanding the evolution of macro-scale graphite properties with neutron irradiation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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