Effects of a carbon convection field on large diamond growth under high-pressure high-temperature conditions

Abstract

Mei-Hua(胡美华) a) , Li Shang-Sheng(李尚升) a) , Ma Hong-An(马红安) b) , Su Tai-Chao(宿太超) a) , Li Xiao-Lei(李小雷) a) , Hu Qiang(胡 强) a) , and Jia Xiao-Peng(贾晓鹏) a)b) †

Synthesis of N-type semiconductor diamonds with sulfur, boron co-doping in FeNiMnCo-C system at high pressure and high temperature

“…[28] The temperature was measured by a Pt6%Rh-Pt30%Rh thermocouple. [29] An optical microscope was employed to characterize the color, morphology, and inclusions of the synthetic large diamonds. XPS analysis (instrument model: PHI X-tool, x-ray source: Al 1486.6 eV Mono at 21.3 W, step size: 0.1 eV, beam diameter: 201.9 µm, spatial resolution: 100 µm) confirmed the presence of B, S, and N in the diamonds.…”

Inclusions in large diamond single crystals at different temperatures of synthesis

“…As a functional material with many ultimate uses, diamond has applications in many fields. [1][2][3][4][5][6][7][8] At present, the main synthetic method of diamond growth is the high pressure and high temperature (HPHT) static pressure method using metal catalyst as medium. [9][10][11] Generally, graphite dissolves in the melt of alloy catalysts, whose components are Fe, Ni, Co, Mn, Cr, etc., and precipitates to grow as diamond under HPHT.…”

Influence of carbon convection field on high quality large single crystal diamonds morphology under high pressure and high temperature

“…Besides, during the crystal growth process, the carbon convection eld around the seed diamond also has signicant effect on the morphology of the diamond. 17 In order to understand and optimize the growth process of diamond single crystals using the TGG method, it is necessary to investigate the detailed information about the nature of the convection eld of particular growth systems. However, it is very difficult to characterize the convection eld experimentally, such as the ow tendency and intensity of carbon in the molten catalyst/solvent under HPHT conditions.…”