Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature
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 transmissio...
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MDPI AG
2015-02-01
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| Series: | Entropy |
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| Online Access: | http://www.mdpi.com/1099-4300/17/2/755 |
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| author | Xiao-Fei Guo Bin Xu Wen Zhang Mei-Zhe Lv Hong-Mei Yang Xiao-Hong Fan |
| author_facet | Xiao-Fei Guo Bin Xu Wen Zhang Mei-Zhe Lv Hong-Mei Yang Xiao-Hong Fan |
| author_sort | Xiao-Fei Guo |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T22:04:21Z |
| format | Article |
| id | doaj.art-a0d9d45ab6cc41399d4b33dc34ddb2e5 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T22:04:21Z |
| publishDate | 2015-02-01 |
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| spelling | doaj.art-a0d9d45ab6cc41399d4b33dc34ddb2e52022-12-22T04:00:46ZengMDPI AGEntropy1099-43002015-02-0117275576210.3390/e17020755e17020755Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High TemperatureXiao-Fei Guo0Bin Xu1Wen Zhang2Mei-Zhe Lv3Hong-Mei Yang4Xiao-Hong Fan5School of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, ChinaSchool of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, ChinaSchool of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, ChinaSchool of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, ChinaSchool of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, ChinaSchool of Material Science and Engineering, Shandong Jianzhu University, Ji'nan 250101, ChinaThe 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.http://www.mdpi.com/1099-4300/17/2/755cubic boron nitridehigh pressure and high temperaturecritical nucleation radiuscrystal growth velocity |
| spellingShingle | Xiao-Fei Guo Bin Xu Wen Zhang Mei-Zhe Lv Hong-Mei Yang Xiao-Hong Fan Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature Entropy cubic boron nitride high pressure and high temperature critical nucleation radius crystal growth velocity |
| title | Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature |
| title_full | Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature |
| title_fullStr | Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature |
| title_full_unstemmed | Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature |
| title_short | Thermodynamic Analysis about Nucleation and Growth of Cubic Boron Nitride Crystals in the hBN-Li3N System under High Pressure and High Temperature |
| title_sort | thermodynamic analysis about nucleation and growth of cubic boron nitride crystals in the hbn li3n system under high pressure and high temperature |
| topic | cubic boron nitride high pressure and high temperature critical nucleation radius crystal growth velocity |
| url | http://www.mdpi.com/1099-4300/17/2/755 |
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