Formation of diamond powders from melamine under high pressure and high temperature

FANG Lei-Ming; CHEN Xi-Ping; SUN Guang-Ai; CHEN Bo; PENG Shu-Ming

doi:10.1088/1674-1137/37/8/088002

Chinese Physics C> 2013, Vol. 37> Issue(8) : 088002 DOI: 10.1088/1674-1137/37/8/088002

Formation of diamond powders from melamine under high pressure and high temperature

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Abstract：
High pressure pyrolysis of melamine has been attracting great interest recently, due to it being considered as a suitable precursor to realize the g-C₃N₄ and even superhard C₃N₄. In this work, we studied the detailed pyrolysis behavior of melamine at 22 GPa. Melamine was stable at 800 ℃, and decomposed to diamond in the form of powder at 1500-2000 ℃ under this pressure condition. At 2000 ℃, the pure cubic diamond powders with 0.1-0.5 μm grain size were obtained. The diamond particles exhibited euhedral forms and dispersed to each other, we proposed that these novel features were caused by the presence of liquid N₂ and NH₃ during diamond formation. The high pressure pyrolysis of melamine may provide a new means of producing micrometer-sized diamond powders.

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FANG Lei-Ming, CHEN Xi-Ping, SUN Guang-Ai, CHEN Bo and PENG Shu-Ming. Formation of diamond powders from melamine under high pressure and high temperature[J]. Chinese Physics C, 2013, 37(8): 088002. doi: 10.1088/1674-1137/37/8/088002

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Received: 2012-10-16
Revised: 2012-11-22

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Formation of diamond powders from melamine under high pressure and high temperature

Corresponding author: FANG Lei-Ming,

Received Date: 2012-10-16

Accepted Date: 2012-11-22

Available Online: 2013-08-05

Abstract: High pressure pyrolysis of melamine has been attracting great interest recently, due to it being considered as a suitable precursor to realize the g-C₃N₄ and even superhard C₃N₄. In this work, we studied the detailed pyrolysis behavior of melamine at 22 GPa. Melamine was stable at 800 ℃, and decomposed to diamond in the form of powder at 1500-2000 ℃ under this pressure condition. At 2000 ℃, the pure cubic diamond powders with 0.1-0.5 μm grain size were obtained. The diamond particles exhibited euhedral forms and dispersed to each other, we proposed that these novel features were caused by the presence of liquid N₂ and NH₃ during diamond formation. The high pressure pyrolysis of melamine may provide a new means of producing micrometer-sized diamond powders.

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Formation of diamond powders from melamine under high pressure and high temperature

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