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arXiv 1503.05429cond-mat.mtrl-sci
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高温高压下立方氮化硼形核的研究

Investigation of the Cubic Boron Nitride Nucleation under the High Pressure and the High Temperature

Su-Gon Kim, Yong-Sob Ri, Gwang-Il Jon, Song-Jin Im

摘要:

本文从微观角度出发,从理论上求出了hBN向cBN转变的活化能($420.38kJ/mol$)。我们提出了一个成核时间与活化能、合成压力和温度关系的解析公式。根据cBN成核的扩散机制,从理论上确定了$P-T$相图中cBN成核区的边界线。通过理论与实验的比较,发现cBN的晶核形成时间比$300ms$短。

英文摘要:

In this paper we have theoretically found the activation energy ($420.38kJ/mol$) for the transformation from hBN to cBN in the microscopic viewpoint. We have introduced an analytical formula representing the dependence of nucleus formation time on the activation energy, synthesis pressure and temperature. We have theoretically determined the boundary line of cBN nucleus formation region in the $P-T$ phase diagram on the basis of the diffusion mechanism of cBN nucleus formation. We have found that the cBN crystal nucleus formation time is less than $300ms$ by comparing of the theory and experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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