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Entropy 2015, 17(2), 755-762; doi:10.3390/e17020755

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

School of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, China
This manuscript is presented on the 1st Electronic Conference of Entropy and Its Application (www.sciforum.net/conference/ecea-1).
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Received: 21 November 2014 / Accepted: 3 February 2015 / Published: 9 February 2015
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Abstract

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. View Full-Text
Keywords: cubic boron nitride; high pressure and high temperature; critical nucleation radius; crystal growth velocity cubic boron nitride; high pressure and high temperature; critical nucleation radius; crystal growth velocity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guo, X.-F.; Xu, B.; Zhang, W.; Lv, M.-Z.; Yang, H.-M.; Fan, X.-H. Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature. Entropy 2015, 17, 755-762.

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