Interlayer structure changes of graphite after hydrogen ion irradiation

被引:20
作者
Gotoh, Y
机构
[1] Hitachi Research Laboratory, Hitachi Ltd., Hitachi, Ibaraki 317, 1-1, Saiwai-cho
关键词
D O I
10.1016/S0022-3115(97)00115-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Changes in graphite interlayer orderings due to keV energy hydrogen irradiation were investigated as a basic step for studies of plasma-wall interactions in fusion reactors. Distribution of interplanar spacings within a 0-45 nm deep implantation layer was measured using Fourier transforms of the (002) lattice fringe images from HRTEM taken at side facets of 700 nm diameter graphite whiskers after 1 keV H+ irradiation. Discrete increases of the interplanar spacing from 0.34 nm to 0.38, 0.41 and 0.43 nm were observed, with other indications at 0.47, 0.56, 0.62 and 0.69 nm. A sub-peak formation at 0.376, and at 0.402 nm was also observed in (002) spectra of X-ray diffraction (XRD)of 200 nm diameter whiskers after 1-6 keV H+ irradiations at 673 K,and at 623 K, respectively. The increases to 0.38 and 0.41-0.43 nm were explained through sp(3) type C-H bond formation in hexagonal carbon networks at the 'low' trapped H densities (H/C < 0.4), and the 'high' trapped H densities (H/C > 0.4), respectively, while those at 0.47-0.69 nm were attributed to interlayer, axial CH3-bond formations and CxHy molecule insertions. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:46 / 51
页数:6
相关论文
共 8 条