硫掺杂金刚石中杂质含量的表征与测定

Measurement of impurity inclusions in sulfur-doped diamond

本文利用扫描电镜、电子探针和波长色散X射线荧光光谱,在硫-Ni70Mn25Co5触媒-石墨粉末混合体系中,用高温高压合成法生产的金刚石,进行了全面表征,并讨论了硫对合成结果影响的原因。研究表明:硫掺杂金刚石随原料中硫含量的增加,颜色逐渐加深,金刚石表面出现孔洞缺陷,当硫含量较低时,孔洞缺陷多分布在(100)晶面上,当硫含量较高时,(111)晶面上也出现孔洞,致使晶体的完整性受到制约;杂质元素进入晶体具有晶面趋向性,Ni,Co,S杂质,特别是Mn杂质易进入金刚石的(100)晶面;金刚石中的硫杂质含量随添加剂含量的增加大致呈增加趋势,锰杂质含量呈增加趋势,而镍杂质没有十分明显的规律性。

Diamond crystals, which were synthesized with powder catalyst made of Ni70Mn25Co5 and sulfer under high pressure and high temperature （HPHT）, were characterized by scanning electron microscopy （SEM）, electron probe and wave dispersive X radial fluorescence. The influence of sulfur on the synthesized diamond was analysed. The results show that the color of diamond graduall found on the surface of diamond when the content of sulfur was increased in y became darker and cavities were the starting materials. With lower content of sulfur in Ni-Mn-Co powders , some cavities were found on the （100） surface, whereas with higher content of sulfur many cavities appeared on the （ 111 ） surface of diamond, thus diamond crystals become misshaped. The distribution of impurities on surface is inhomogeneous, and Ni, Co, S impurities, especially Mn impurity ,had a tendency towards the （100） surface. The content of sulfur in the diamond synthesized by Ni - Mn -Co powders catalyst tended to augment with additive sulfur increased. Under the same conditions, the concentration of Mn impurity tended to increase, but Ni impurity showed no obvious regularity.