物理学报2025，Vol.74Issue(7)：48-56,9.DOI:10.7498/aps.74.20241769
Li3N添加金刚石单晶的高温高压生长研究
Study on the growth of Li3N doped diamond single crystals under HPHT
摘要
Abstract
In the paper,under 5.8 GPa and 1300 ℃,the Li3N doped diamond single crystals were synthesized in a cubic anvil high pressure and high temperature apparatus.Firstly,Fe5gNi25Co16 alloy was used as the catalyst,high-purity Li3N powder was used as the additive,industrial high-purity graphite powder was used as the carbon source,and the(100)crystal orientation of industrial grade diamond single crystal with good crystalline quality was used as the growth direction of diamond single crystal,the effect of Li3N addition ratio on the growth of diamond single crystals was systematically investigated with a growth time of 20 h.The research results indicate that with the increase of Li3N addition ratio,the color of diamond single crystals gradually transitions from yellow green,green,and dark green to dark green,and their morphology gradually transitions from hexahedron,hexahedron to octahedron.Moreover,the growth rate of single crystals decreases with the gradual increase of Li3N addition ratio,which can be attributed to the phenomenon of upward movement in the"V-shaped region"of diamond single crystal growth with the gradual increase of Li3N addition ratio in the P-T phase diagram of carbon.Secondly,using Fourier transform infrared(FTIR)spectroscopy,it was revealed that the nitrogen content of diamond single crystals increases with the increase of Li3N addition ratio,and increasing the diamond growth pressure can achieve the increase in the nitrogen content of diamond single crystals.Figure 5 shows FTIR spectra of diamond crystals synthesized under different Li3N addition ratios.When the weight percent of Li3N added to the catalyst is 0.55％,the nitrogen content of the grown diamond single crystal is 8.92×10-4.Thirdly,Raman spectroscopy testing revealed that the Raman characteristic peak of diamond single crystals gradually shifts towards the low-energy end with the increase of Li3N addition ratio,which is related to the increase of internal stress in diamond single crystals.Finally,the PL spectroscopy test results showed that this study achieved high temperature and high pressure preparation of diamond single crystals with NV-color centers,and the zero phonon line intensity of NV-color centers in the single crystals significantly decreased with the increase of crystal nitrogen content.Figure 7 shows PL spectra of diamond crystals synthesized under different Li3N addition ratios.关键词
高温高压/金刚石大单晶/触媒/Li3NKey words
high temperature and high pressure/diamond single crystals/catalyst/Li3N引用本文复制引用
肖宏宇,王帅,康如威,李勇,李尚升,田昌海,王强,金慧,马红安..Li3N添加金刚石单晶的高温高压生长研究[J].物理学报,2025,74(7):48-56,9.基金项目
国家自然科学基金(批准号:12064038)、贵州省科技厅自然科学项目(批准号:黔科合基础-ZK[2023]467,ZK[2021]021)、贵州省百层次人才项目(批准号:GCCC[2023]087)、河南省科技攻关项目(批准号:232102231048)和铜仁学院科研启动基金(批准号:trxyDH2221)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.12064038),the Natural Science Program of Guizhou Province,China(Grant Nos.Qiankehejichu ZK[2023]467,ZK[2021]021),the Foundation for Excellent Scholars of Guizhou Province,China(Grant No.GCCC[2023]087),the Key Science and Technology Program of Henan Province,China(Grant No.232102231048),and the Staring Foundation of Scientific Research of Tongren University,China(Grant No.trxyDH2221). （批准号:12064038）
