金刚石单晶高温高压合成中氮对硫的影响

Effect of Nitrogen on the Incorporation of Sulfur during the Diamond Growth under High Pressure and High Temperature

为了研究在金刚石大单晶生长过程中氮对硫的影响,在6.5 GPa高压条件下采用温度梯度法分别研究了两种不同合成体系中金刚石的合成。利用傅里叶显微红外光谱(FTIR)仪对所合成的金刚石进行了测试,测试结果表明:晶体中(a)中不含有氮,晶体中(b)中氮的浓度为280 ppm。此外,对所合成的样品进行了X射线光电子能谱测试,测试结果表明:在Ib型金刚石中有硫元素存在,而硫未进入到IIa型金刚石中。因此,金刚石中氮的存在对金刚石中硫的进入有促进作用。

In order to study the effect of nitrogen on the incorporation of sulfur into diamond during the diamond growth under high pressure and high temperature conditions, diamond crystals were synthesized in different synthesis systems at pressure of 6. 5 GPa using temperature gradient growth method, respectively. The obtained crystals were characterized by FTIR and the results indicate that nitrogen is inexistence in IIa type diamond and the nitrogen concentration of diamond （b） is approximately 280 ppm. Furthermore, the samples were measured by XPS and the measurement results show that sulfur is found in Ib type diamond （b）. However, sulfur is absent in IIa type diamond. It allowed us to speculate that the existence of nitrogen in the diamond would enhance the incorporation of sulfur into diamond.