Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature†

Entropy

Xiao-Fei Guo²  Bin Xu¹  Wen Zhang²  Mei-Zhe Lv²  Hong-Mei Yang² 

[1] School of Material Science and Engineering, Shandong Jianzhu University, Ji’nan 250101, China;

关键词: cubic boron nitride;    high pressure and high temperature;    critical nucleation radius;    crystal growth velocity;   

DOI  :  10.3390/e17020755

来源: mdpi

【 摘 要 】

The nucleation of cubic boron nitride (cBN) single crystals synthesized with lithium nitride (Li₃N) as a catalyst under high pressure and high temperature (HPHT) was analyzed. Many nanometer-sized cubic boron nitride nuclei formed in the near surface layer, as detected by high resolution transmission electron microscopy. Based on the experiment results, the transformation kinetics is described by a nucleation and growth process in the thermodynamic stability region of cBN. A theoretical description is developed based on the heterogeneous nucleation and layer growth mechanism, and the relevant parameters are estimated and discussed. The critical crystal radius, r*, increases with the temperature under constant pressure; the change with temperature more pronounced at lower pressure (such as 4.5 GPa). The crystal growth velocity increased with the temperature, and it is parabolic with temperature under certain pressure. These results are consistent with experimental data.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland