中文摘要：

利用高温高压温度梯度法，在优质六面体金刚石大单晶稳定生长的基础上，合理调整晶床高度为5mm，在1300—1350℃温度区域30h合成优质六面体晶体重量达2．04克拉，生长速度高达13．6mg／h。三种晶体样品（本实验合成晶体，日本住友公司合成晶体，元素六公司合成晶体）经显微红外吸收（IR）测试，本实验合成晶体{100}晶面的平均氮含量为240ppm，高于日本住友和元素六晶体样品的氮含量；三种晶体样品经激光拉曼测试，均在1332cm-1左右出现了较强的金刚石拉曼标准峰，利用高斯模拟计算出本实验合成晶体拉曼峰的半高宽值为5．570cm-1，大于日本住友晶体样品而小于元素六合成的晶体样品；对三种晶体样品的生长速度、氮含量分布和晶格结晶程度分析，由于本实验合成六面体晶体的生长速度远大于二者，使晶体的晶格结晶程度稍差于日本住友样品而优于元素六晶体，结合激光拉曼图谱分析本实验合成的六面体晶体中有少量杂质存在，或许这些杂质的存在正是导致其{100}晶面氮含量高于日本住友样品氮含量的主要原因。

英文摘要：

In this paper, high quality hexahedron diamond crystals were grown via the temperature gradient under high pressure and high temperature （HPHT） , which is between 1300 ℃ and 1350 ℃. The crystals were grown based on the steady growth of the high quality big single crystal through rational adjusting the crystal bed high to 5 mm. The results show that the weight of the crystal is 2.04 carat in 30 h, and the growth rate by weight was achieved to 13.6 mg/h, which was far much higher than samples from Sumitomo Corporation of Japan and Element Six Corporation. The lattice crystallization degree was lower than the Sumitomo Corp. sample, but higher than that of the Element Six Corp. sample. The strong diamond Raman standard peak was appeared in the 1332 cm-1 place of our diamond samples by the Laser-Raman test, and the half tall wide value of the Raman peak is 5. 570 cm-1 by the Gaussian simulation. The average nitrogen content of our diamond samples was 240 ppm of the { 100 } faces, which was much higher than the Sumitomo and Element Six samples, because of the existence of impurity in the test conditions.