Nature and Cultivated Diamond: Quality Characterization and Color Causes Analysis

Abstract

Abstract: Diamond is a typical superhard multifunctional material with excellent properties such as the highest hardness, ultra-wide band gap and the highest thermal conductivity. The reserve of natural diamond is small and the price is expensive. Color diamonds are a very small part of nature diamonds and their coloring mechanisms are extremly complicated. It is a effective method to synthesize diamond by high temperature and high pressure method, but it is still a great challenge to modulate and realize color diamonds. In this paper, the quality, structural defects and impurities of color (pink and green) diamonds were studied by Raman, photuluminescence, infrared and visible absorption technologies, and the quality, defect changes with temperature and the cause of color were studied in detail. It is found that the coloring mechanism was related to electrically neutral N₂V defect (H₃), shear stress, plastic deformation and NV⁰/NV^- color center etc. Obtaining color diamonds by various methods is not only for their highly valued gemstones, but also helps people to further understand the formation mechanism of diamond, and provides a new reference for the cultivation of colored diamonds.

Key words: color diamond, superhard material, natural diamond, high temperature and high pressure, color center, coloring mechanism

CLC Number:

TQ164.8

PAN Yue, LIU Shucheng, ZHANG Xiaoming, ZHANG Bangxuan, YAO Di, HU Kuo, ZANG Chuanyi, ZHOU Qiang, LIU Zhaodong, LIU Bingbing. Nature and Cultivated Diamond: Quality Characterization and Color Causes Analysis[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2023, 52(11): 1939-1945.

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