硫对金刚石大单晶合成的影响本科材料专业毕业论文.doc

硫对金刚石大单晶合成的影响 摘 要 金刚石是具有诸多优异性能的极限材料，广泛用于工业、科技、国防、医疗卫生等领域。掺硫金刚石具有诸多优良的性质,比普通金刚石显示出更优异的性能，因而成为当前金刚石掺杂中的研究热点。 本文是通过将一定比例的硫粉均匀的加入到金刚石合成体系中，在六面顶压机上利用高温高压方法合成掺硫金刚石。实验通过设置掺硫梯度，研究了不同含量的硫对金刚石合成的影响。实验分为两个部分进行研究：（1）实验摸索阶段：通过合成不掺加硫的金刚石确定实验条件，最终确定实验条件为，压力：74.5Mpa，晶床和堵头尺寸：6mm和7mm；（2）掺硫金刚石合成阶段：在第一阶段设置的实验条件下，将不同比例的硫粉掺入金刚石合成体系中，合成金刚石。通过研究发现：随着系统中的硫含量的增加Abstract Diamond is the ultimate material has many excellent properties, is widely used in industry, science and technology, national defense, medical and health fields. Sulfur doped diamond has many excellent properties, than ordinary diamond shows more excellent performance, has become the current research focus of doping of diamond. This paper is sulfur powder through a certain proportion of the evenly added to the diamond synthetic system, synthesis of sulfur doped diamond by using high temperature and high pressure in the six cubic press. The experiment by setting the sulfur doping gradient, the effects of different content of sulfur in diamond synthesis. The experiment was divided into two parts: (1) experiment fumble stage: the experimental conditions were determined by synthesis without addition of sulfur diamond, ultimately determine the experimental conditions, pressure: 74.5Mpa, crystal bed and plug size: 6mm and 7mm; (2) sulfur doped diamond synthesis stage: the first stage setting next, the sulfur powder by adding different proportion into diamond synthesis system,synthetic diamond. Through the study found that: with the increase of sulfur content in the system, the color of diamond crystals gradually began to change, gradually change from yellow to dark yellow and black. At the same time with the increase of sulfur content, size and the integrity of the crystal is reduced, and pits on the surface of crystal is more and more serious,and inclusions in the crystal content increased, and the scattered gradually increased to run through the whole crystal.Through comparison of diamond Raman spectra of sulfur doped and undope