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1、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
2、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，金刚石晶体的颜色开始逐渐发生变化，由黄色逐渐变为暗黄和黑色。同时随着含硫量的增加，晶体的尺寸和完整度减少，而且晶体表面上的凹坑越来越严重，并且晶体中包裹体含量增加，并由弥散状逐渐增加到贯穿整个晶体内部。通过对掺硫和未掺硫的金刚石拉曼图谱进行对比，我们得出在误差允许的范围内拉曼峰和半高宽都基本在很小范围内波动，金刚石拉曼峰基本没有变化。关键字：金刚石；高温高压；硫掺杂。AbstractDiamond is the ultimate material has many excellent properties, is wid
3、ely 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 cer
4、tain 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 experi
5、ment 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 s
6、tage: 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
7、 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 who
8、le crystal.Through comparison of diamond Raman spectra of sulfur doped and undoped sulfur, we draw in the tolerance of the Raman peaks and FWHM are basic varies in a small range, the diamond Raman peak basically no 河南理工大学万方科技学院毕业论文change.Keywords: diamond; high temperature and high pressure;sulfur-d
9、oped.河南理工大学万方科技学院毕业论文i目 录第一章 绪论.11.1 金刚石简介.11.1.1 金刚石的组成.11.1.2 金刚石的结构.21.1.3 金刚石的性质和用途.31.1.4 金刚石的分类.51.1.5 金刚石的成因.61.2 金刚石的开发简史和研究现状.61.2.1 金刚石的开发简史.61.2.2 金刚石的研究现状.71.3 选题意义以及主要研究内容.8第二章 金刚石的合成理论.102.1 金刚石的生长规律.102.1.1 金刚石生长的一般规律.102.1.2 影响金刚石晶体生长速度的主要因素.112.1.3 金刚石生长速度的分区及分析.122.2 金刚石合成技术.142.2.1 高温高压技术.142.2.2 温度梯度法.142.3 合成实验的精密化控制.172.3.1 压力控制.172.3.2 温度控制与功率控制.18第三章 原材料、设备和组装.203.1 原材料.203.1.1 传压介质叶蜡石和白云石.203.1.2 石墨.223.1.3 触媒.223.1.4 氯化钠.223.1.5 材料加工.233.2 实验设备介绍.
