Defect topology and annihilation by cooperative movement of atoms in neutron-irradiated graphite
| العنوان: | Defect topology and annihilation by cooperative movement of atoms in neutron-irradiated graphite |
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| المؤلفون: | Ratikant Mishra, P. U. M. Sastry, Sourabh Wajhal, Mayanak K. Gupta, A. B. Shinde, Himanshu K. Poswal, Samrath L. Chaplot, Sanjay Kumar Mishra, P. S. R. Krishna, Rakesh Ranjan, P. D. Babu, Baltej Singh, Ranjan Mittal |
| المصدر: | Physical Review B. 102 |
| بيانات النشر: | American Physical Society (APS), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | education.field_of_study, Materials science, Annihilation, Graphene, Population, 02 engineering and technology, Carbon nanotube, 021001 nanoscience & nanotechnology, Topology, 01 natural sciences, law.invention, Condensed Matter::Materials Science, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, Graphite, Physics::Chemical Physics, Wigner effect, 010306 general physics, 0210 nano-technology, education, Neutron moderator |
| الوصف: | Graphite has been used as a neutron moderator or reflector in many nuclear reactors. The irradiation of graphite in a nuclear reactor results in a complex population of defects. Heating of the irradiated graphite at high temperatures results in annihilation of the defects with release of an unusually large energy, called the Wigner energy. From various experiments on highly irradiated graphite samples from the CIRUS reactor at Trombay and ab initio simulations, we have identified various 2-, 3-, and 4-coordinated topological structures in defected graphite, and provided a microscopic mechanism of defect annihilation on heating and release of the Wigner energy. The annihilation process involves cascading cooperative movement of atoms in multiple steps involving an intermediate structure. Our work provides insights in understanding of the defect topologies and annihilation in graphite which is of considerable importance to wider areas of graphitic materials including graphene and carbon nanotubes. |
| تدمد: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.064103 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::c35823e10e22aae2cde8046c277bda37 https://doi.org/10.1103/physrevb.102.064103 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........c35823e10e22aae2cde8046c277bda37 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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| DOI: | 10.1103/physrevb.102.064103 |