Significant improvement of multi-seed method of diamond synthesis by adjusting the lateral cooling water temperature

Abstract

In this work, we use a multi-seed arrangement assembly with an annular carbon source to synthesize large single-crystals of diamond and investigate the influence of the external environment on the synthesis of diamonds by adjusting the lateral cooling water temperature under high pressure and high temperature conditions. The finite element method (FEM) is used to simulate the temperature and convection fields of the synthetic cavity. The simulation results show that the radial temperature distribution of the catalyst is uniform. In addition, the distribution of the convection field of the employed catalyst is also asymmetric. The asymmetric distribution of the temperature field and convection field could lead to the asymmetric consumption of carbon sources, and then lead to the asymmetric growth of the diamond crystals. Diamond synthesis experimental results proved the correctness of our simulation results.