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Volume 12
Issue 9
10.3390/cryst12091264
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Article

Morphological and Surface Microtopographic Features of HPHT-Grown Diamond Crystals with Contact Twinning

by
Kaiyue Sun
1,
Taijin Lu
2,*,
Mingyue He
1,*,
Zhonghua Song
2,
Jian Zhang
2 and
Jie Ke
2
1
School of Gemmology, China University of Geosciences, Beijing 100083, China
2
National Gems & Jewelry Testing Co., Ltd., Beijing 100013, China
*
Authors to whom correspondence should be addressed.
Crystals 2022, 12(9), 1264; https://doi.org/10.3390/cryst12091264
Submission received: 18 July 2022 / Revised: 12 August 2022 / Accepted: 1 September 2022 / Published: 6 September 2022
(This article belongs to the Special Issue Diamonds: Growth, Properties and Applications)
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Abstract

Gem-grade twinned high-pressure high-temperature (HPHT) synthetic diamond crystals are rare. Hence, few investigations on their morphological features and formation have been reported. In this article, the morphological and surface microtopographic features of HPHT synthetic-diamond crystals contact twinning is detailed and investigated. It indicates that twins of diamond forming and nucleating during the early stages of the growth and the development of {100} and {111} growth sectors on either side of such boundaries proceeds independently, which affects the final morphology of the diamond crystals. According to the different features of crystal macroscopic morphological properties, two kinds of twin model have been established. The formation of twin crystals changed the lattice of diamonds with face-centered cubic dimensions. The type of diamond lattice at the twin boundary is hexagonal and closely packed, which has potential for further developing the application of synthetic diamond twin crystals.
Keywords: crystal morphology; surface microtopographic features; contact twinning; HPHT diamond crystal morphology; surface microtopographic features; contact twinning; HPHT diamond

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MDPI and ACS Style

Sun, K.; Lu, T.; He, M.; Song, Z.; Zhang, J.; Ke, J. Morphological and Surface Microtopographic Features of HPHT-Grown Diamond Crystals with Contact Twinning. Crystals 2022, 12, 1264. https://doi.org/10.3390/cryst12091264

AMA Style

Sun K, Lu T, He M, Song Z, Zhang J, Ke J. Morphological and Surface Microtopographic Features of HPHT-Grown Diamond Crystals with Contact Twinning. Crystals. 2022; 12(9):1264. https://doi.org/10.3390/cryst12091264

Chicago/Turabian Style

Sun, Kaiyue, Taijin Lu, Mingyue He, Zhonghua Song, Jian Zhang, and Jie Ke. 2022. "Morphological and Surface Microtopographic Features of HPHT-Grown Diamond Crystals with Contact Twinning" Crystals 12, no. 9: 1264. https://doi.org/10.3390/cryst12091264

APA Style

Sun, K., Lu, T., He, M., Song, Z., Zhang, J., & Ke, J. (2022). Morphological and Surface Microtopographic Features of HPHT-Grown Diamond Crystals with Contact Twinning. Crystals, 12(9), 1264. https://doi.org/10.3390/cryst12091264

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