论文标题
缺陷拓扑和an灭是通过高度中子辐照石墨中原子的合作级联运动
Defect topology and annihilation by cooperative cascading movement of atoms in highly neutron irradiated graphite
论文作者
论文摘要
石墨已被用作许多核反应堆中的中子主持人或反射器。石墨在核反应堆中的照射导致缺陷群。在高温下辐照的石墨加热导致缺陷灭绝，而异常大的能量（称为Wigner Energy）。从在Trombay和Ab-Initio模拟的CIRUS反应器高度辐照的石墨样品上进行的各种实验，我们首次在缺陷石墨中鉴定出各种2，3和4配位的拓扑结构，并提供了在Wigner Energy加热和释放Wigner Energy的缺陷灭绝机制。歼灭过程涉及将原子的合作运动分为涉及中间结构的两个步骤。我们的工作为理解石墨中的缺陷拓扑和an灭提供了新的见解，这对于包括石墨烯和碳纳米管在内的石墨材料的更广泛区域至关重要。
Graphite has been used as 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 CIRUS reactor at Trombay and ab-initio simulations, we have for the first time identified various 2-, 3- and 4-coordinated topological structures in defected graphite, and provided microscopic mechanism of defect annihilation on heating and release of the Wigner energy. The annihilation process involves cascading cooperative movement of atoms in two steps involving an intermediate structure. Our work provides new 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.
