铁基金属包膜界面的精细结构与金刚石单晶生长

Fine Structure of Fe-Based Metal Film Interface and Diamond Single Crystal Growth

采用场发射扫描电子显微镜(FESEM),研究了铁基金属包膜界面及其断面的精细结构。结果表明:包膜(100)界面有纳米级的棱锥状突起,包膜(111)界面上分布着锯齿状的台阶;金属包膜近触媒侧的界面断面表层分布着台阶形貌的胞状突起;断面其它断层断口呈现脆性断裂特征,断层表面分布着团簇状的纳米颗粒。分析认为:包膜界面的不同形貌与片状金刚石结晶基元的不同生长过程有关;由于包膜内脆性碳化物的存在,包膜断面呈现脆性断口特征;断面上分布的纳米级颗粒可能是金属成分的共晶析出产物。

Field emission scanning electron microscope（FESEM） has been used to investigate the fine structure of Fe-based metal film interface and its cross-section.It is shown that nanoscale pyramid cone shapes are found on the metal film interface（100）,serrate steps are found on the metal film interface（111）,and cystiform shapes with terrace structure are found on the cross-section near the catalyst.Other faults have brittleness fracture characteristic with nanoscale clusters are found on the fault surface.It is proposed that the different morphologies of the metal film have relations with catalyzing mechanism.The brittleness fracture characteristic of the cross-sectionon might be due to the carbide existence,and the nanoscale particles should be eutectic carbides.