Thermodynamic analysis on synthesis process of diamond

Abstract

Based upon the thermodynamic analysis of the nucleation of diamond crystal, the effects of synthesis temperature and pressure on the nucleation of diamond crystal, diamond growth and output of diamond crystal, particle size and strength were discussed. The results show that the excess pressure has an important effect on the critical radius of nucleation and thermodynamic barrier in the formation of a critical nucleus. Considering the excess pressure, the expression of diamond nucleation rate was obtained.

Keywords

diamond synthesis / pressure / temperature / nucleation / growth

References

[1] CHONG Qiwu. At past, now and future the catalytic material for artificial diamond[A]. Collected Works of Chinese Superhard Materials Development Strategy Forurn[C]. Shenzheng, 1993. 41–49.

[2] QiZhengdu. Temperature control in artificial diamond grow[J]. Journal of High Pressures Physics, 1990, 4(3): 204-208(in Chinese)

[3] SHENG Menxiong, HE An, Tang Bo. The choose of increasing pressure fashion in artificial diamond synthesis technology [J]. Hunan Metallurgy (in Chinese), 1994, (3): 18–20.

[4] СоблеВВ, СлобопскойВЯ, ТубенкоСИ, et al. Сппавы-Катапнэаторы сметастабнлъной [J]. СВЕРХТВЕРПЫЕ МАТЕРИАПЫ, 1992, (4): 14–20.

[5] HigaoKanda, ToshikazuOhsawa. Growth condition for the dodecahedral from synthetic diamonds [J]. J Crystal Growth, 1989, 94: 115-124

[6] QingQianSolid-state physics (in Chinese) [M], 1979, Beijing, Publishing House of People Education

[7] WangChunsheng, ZengYongqian, Wujing. Thermodynamic analysis of nucleation process[J]. Journal of Artifical Crystal, 1994, 23(1): 50-55(in Chinese)

[8] DuMingxi, LiYinghua. The thermodynamic condition of the growth of rough particle diamond[J]. Journal of High Pressure Physics, 1994, 8(1): 36-42(in Chinese)

[9] SungaghnaI. Growth and morphology of diamond crystals under stable and metastable conditions[J]. J of Crystal Growth, 1990, 90: 1156-1161

[10] ДелооеевДВ, ДерятниВВ. Терголынамичецкие функиналмаэа Итрафитм В интервапе темлертур 300–3000К ИЭВ АН ООСР 1978, 97: 238.

[11] DingPeiPhysical chemistry (in Chinese) [M], 1979, Beijing, Metallurgy Industry Press

[12] XieYouzangDiamond theory and synthetic technology (in Chinese) [M], 1997, Changsha, Hunan Science and Technology Press

[13] PerryJ. Diamond formation in solid metal[J]. Res Bull, 1990, 25: 747-747

[14] Strong H M, Hasnnaman R E. Catalyst effect on the transformation of graphite to diamond[J]. J Chem Phys, 1987, (2): 3668.