Interstitial and vacancy loops in graphite irradiated at high temperatures

作者: P A Thrower

DOI: 10.1088/0508-3443/15/10/302

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摘要: An electron microscope examination of neutron damage in graphite single crystals irradiated at 900°C and 1200°C reveals two types defect, which have been identified by detailed studies their diffraction contrast. Large interstitial loops radius about 350 A are surrounded small vacancy appear to form stress fields. After annealing 1820°C some the sheared a configuration lower stacking fault energy. This behaviour is unexpected casts doubt on previous identifications defect graphite. possible mechanism for this phenomenon discussed `A over A' energy estimated be 70 erg cm-2.

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