Effects of {100} Seed Crystal Surface with Different Shape on the HPHT Synthetic Large Single Crystal Diamonds

WANG Yao; MA Hong’an; YANG Zhiqiang; DING Luyao; WANG Zhanke; JIA Xiaopeng

doi:10.11858/gywlxb.20190708

Volume 33 Issue 4

Jul 2019

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Article Contents

Chinese Journal of High Pressure Physics > 2019 > 33(4): 043301.

WANG Yao, MA Hong’an, YANG Zhiqiang, DING Luyao, WANG Zhanke, JIA Xiaopeng. Effects of {100} Seed Crystal Surface with Different Shape on the HPHT Synthetic Large Single Crystal Diamonds[J]. Chinese Journal of High Pressure Physics, 2019, 33(4): 043301. doi: 10.11858/gywlxb.20190708

Citation:

WANG Yao, MA Hong’an, YANG Zhiqiang, DING Luyao, WANG Zhanke, JIA Xiaopeng. Effects of {100} Seed Crystal Surface with Different Shape on the HPHT Synthetic Large Single Crystal Diamonds[J]. Chinese Journal of High Pressure Physics, 2019, 33(4): 043301. doi: 10.11858/gywlxb.20190708

Citation:

WANG Yao, MA Hong’an, YANG Zhiqiang, DING Luyao, WANG Zhanke, JIA Xiaopeng. Effects of {100} Seed Crystal Surface with Different Shape on the HPHT Synthetic Large Single Crystal Diamonds[J]. Chinese Journal of High Pressure Physics, 2019, 33(4): 043301. doi: 10.11858/gywlxb.20190708

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Effects of {100} Seed Crystal Surface with Different Shape on the HPHT Synthetic Large Single Crystal Diamonds

doi: 10.11858/gywlxb.20190708

State Key Laboratory of Superhard Materials, School of Physics, Jilin University, Changchun 130012, China

Received Date: 10 Jan 2019
Rev Recd Date: 22 Jan 2019
Publish Date: 25 Apr 2019

Abstract

Abstract

A series of high-quality Ib diamonds was successfully synthesized by {100} seed crystals with different shapes in NiMnCo-C system, using the temperature gradient method at pressure of 5.5 GPa and temperature of 1260–1300 ℃. The morphology of the crystal was characterized by optical microscopy and electron microscopy. It is found that cutting the {100} surface of synthetic seed crystal into different shapes will only change the aspect ratio of the crystal, and the crystal will not deviate from the normal morphology of {100} crystal due to the change of the shape of seed crystal. The quality of crystal synthesis is affected by the aspect ratio of the seed. When the ratio of length to width of seed crystal is small, the quality of crystal synthesis can be guaranteed and high quality crystal can be synthesized. However, there are many defects in the lower surface of synthetic crystal when the ratio of seed length to width is too large. This study reveals the relationship between seed shape and synthetic crystal morphology, which is conducive to a deeper understanding of crystal growth process and epitaxial growth mechanism. This study will be useful for future synthesis of diamond with different morphologies. At the same time, this research will help to expand the scope of seed crystal selection, reduce the difficulty of seed crystal selection, improve the utilization rate of industrial grade diamond, and provide technical support for the seed crystal selection of synthetic large single crystal diamond.
- seed crystal morphology,
- diamond synthesis,
- high temperature and high pressure,
- temperature gradient method

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References(24)

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