Some etch pits were observed on {100} face of the most diamond crystals which are synthesized with sulfur-added Fe-Ni, while no etch pit in the diamond synthesized without sulfur additive.

• 在大多数用含添加剂硫的铁镍触媒合成的金刚石的{100}山面，有熔坑出现，而用铁镍触媒合成的金刚石没有这种现象；