Growth Characteristics of Type Ⅰb Diamonds in FeNi, NiMnCo and Their Composite Catalysts

Abstract

Abstract: In this paper, Ni₇₀Mn₂₅Co₅ and Fe₆₄Ni₃₆ alloys and their composite alloys were used as catalysts to study the growth characteristics of typeⅠb diamonds grown along (100) crystal plane at different temperatures under 5.6 GPa pressure by high temperature and high pressure temperature gradient method. The results show that the diamond synthesized with Fe₆₄Ni₃₆ catalyst has a cracking growth zone of about 50 K in the high temperature growth range of (111) crystal plane. The diamond synthesized with Ni₇₀Mn₂₅C_o5 catalyst is prone to crystal stock defects in the growth range, especially in the high temperature crystal growth range of (111) crystal plane. The excessive melting of Fe₆₄Ni₃₆ catalyst at high temperature may be the cause of crystal cracking, and the low viscosity of Ni₇₀Mn₂₅Co₅catalyst melt may be the reason for easy formation of crystal stock. The combination of two kinds of catalysts can effectively avoid the formation of cracking and crystal stock. Raman spectroscopic characterization shows that the internal quality of crystal stock is similar to that of single crystals. There are more lattice distortion and impurities in the cracky crystals and the stress in the crystal is larger.The diamond crystal synthesized by compound catalyst system has low internal stress and good quality.

Key words: typeⅠb diamond, high temperature and high pressure synthesis, temperature gradient method, catalyst alloy sheet, cracky crystal, crystal stock

CLC Number:

TQ163

WANG Mengzhao, XU Antao, LI Shangsheng, GAO Guangjin, HU Meihua, SU Taichao, HUANG Guofeng, LI Zhanchang, ZHOU Zhenxiang, NIE Yuan, CHEN Jiaxi, ZHOU Xubiao. Growth Characteristics of Type Ⅰb Diamonds in FeNi, NiMnCo and Their Composite Catalysts[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(11): 2060-2066.

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