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

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...

Full description

Saved in:
Bibliographic Details
Published inYankuàng cèshì Vol. 38; no. 4; pp. 411 - 417
Main Authors Wu, Xu-Xu, Lu, Tai-jin, Yang, Chi-yu, Zhang, Jian, Tang, Shi, Chen, Hua, Zhang, Yong, Ke, Jie, He, Ming-yue
Format Journal Article
LanguageChinese
English
Published Beijing National Research Center of Geoanalysis 01.07.2019
Science Press, PR China
Subjects
crystal growth rate
Crystallography
Depth of field
Diamonds
high pressure-high temperature
High temperature
Inclusions
laser scanning confocal microscopy
micro-structure
Microscopy
Pickling
Raman spectroscopy
synthetic diamond
Synthetic products
China
Online AccessGet full text

Cover

More Information
Summary: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 3 D 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.
ISSN:0254-5357
DOI:10.15898/j.cnki.11-2131/td.201811150122