Observation of Surface Microstructure of HPHT Synthetic Diamond Crystals and Genesis Discussion

WU Xu-xu; LU Tai-jin; YANG Chi-yu; ZHANG Jian; TANG Shi; CHEN Hua; ZHANG Yong; KE Jie; HE Ming-yue

doi:10.15898/j.cnki.11-2131/td.201811150122

Rock and Mineral Analysis > 2019 > 38(4): 411-417. > DOI: 10.15898/j.cnki.11-2131/td.201811150122

WU Xu-xu, LU Tai-jin, YANG Chi-yu, ZHANG Jian, TANG Shi, CHEN Hua, ZHANG Yong, KE Jie, HE Ming-yue. Observation of Surface Microstructure of HPHT Synthetic Diamond Crystals and Genesis Discussion[J]. Rock and Mineral Analysis, 2019, 38(4): 411-417. DOI: 10.15898/j.cnki.11-2131/td.201811150122

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Observation of Surface Microstructure of HPHT Synthetic Diamond Crystals and Genesis Discussion

WU Xu-xu^{1, 2,},
LU Tai-jin^1, ,,
YANG Chi-yu^{1, 2},
ZHANG Jian¹,
TANG Shi¹,
CHEN Hua¹,
ZHANG Yong¹,
KE Jie¹,
HE Ming-yue²

1.
Research Institute of Beijing, National Gems & Jewelry Technology Administrative Center, Ministry of Natural Resources, Beijing 100013, China
2.
School of Gemmology, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Received Date: November 14, 2018
Revised Date: March 17, 2019
Accepted Date: April 08, 2019
Available Online: November 28, 2022

Abstract

HIGHLIGHTS
(1) A summary of three characteristic structures of synthetic diamonds at high temperature and high pressure.

(2) Proposition and discussion of the 'rope-tied' structures of HPHT synthetic diamonds.

(3) Analysis and demonstration of the relationship of the internal and external micro-structures of HPHT synthetic diamonds with their growth mechanism.

ABSTRACT

BACKGROUND
As the world's largest producer of synthetic diamonds, China accounts for more than 90% of the world's total production, of which high pressure-high temperature (HPHT) synthetic diamonds are dominant. Previous scholars have conducted many studies on analytical methods and property analysis of HPHT synthetic diamonds. However, the research on the pickling process after the growth of HPHT synthetic diamonds and the internal and external micro-structures after pickling is still insufficient.
OBJECTIVES
To characterize 118 synthetic diamonds produced in China by high temperature and high pressure method.
METHODS
The HPHT synthetic diamonds were observed by laser scanning confocal microscopy (LSCM) and ultra-depth-of-field 3D microscopy, and the dark inclusions in these micro-structures were qualitatively analyzed by laser Raman spectroscopy.
RESULTS
Three structure types were found. Step-like growth structures with certain angles revealed the crystallographic characteristics of HPHT synthetic diamond poly-crystals. Near-parallel linear scratches reflected the contact relationship between diamond grains in the growth chamber. The 'rope-tied' structures reflected the growth rate of HPHT synthetic diamonds.
CONCLUSIONS
The micromorphology of these diamond surfaces reflects the growth conditions and environment of HPHT synthetic diamond gradient high temperature and continuous high pressure, which is of significance for the identification of HPHT synthetic diamonds.
- synthetic diamond,
- high pressure-high temperature,
- micro-structure,
- laser scanning confocal microscopy,
- crystal growth rate

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References

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