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Synthesis of Cubic Boron Nitride by the Reaction of Li3N and B2O3 |
| SU Zuo-Peng;DU Yong-Hui;JI Xiao-Rui;YANG Da-Peng;YANG Xu-Xin;GONG Xi-Liang;ZHANG Tie-Chen |
| National Laboratory for Superhard Materials, Jilin University, Changchun 130012 |
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| Cite this article: |
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SU Zuo-Peng, DU Yong-Hui, JI Xiao-Rui et al 2006 Chin. Phys. Lett. 23 2285-2287 |
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Abstract Cubic boron nitride is synthesized by the reaction of Li3N and B2O3 under high pressure and high temperature (4.0--5.0GPa, 1350--1500°C). The minimum pressure of cBN formation is 4.0GPa. The present condition of cBN formation is clearly lower than the eutectic temperature of Li3BN2 and BN in the Li3N-hBN system (5.5GPa, 1610°C). The content of $c$BN in the sample increases, while the content of hBN decreases with the temperature and pressure. The maximum conversion rate (5.0GPa, 1500°C) is about 34%, which is higher than that in the hBN-Li3N system. The cBN crystals are octahedral or tetrahedral in shape and approximately 20μm in diameter.
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| Keywords:
81.20.Ka
81.05.Je
81.10.-h
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Published: 01 August 2006
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| PACS: |
81.20.Ka
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(Chemical synthesis; combustion synthesis)
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81.05.Je
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(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
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81.10.-h
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(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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