Abstract
Cubic boron nitride is synthesized by the reaction of Li3N andB2O3 under high pressure and high temperature (4.0–5.0 GPa,1350–1500°C). The minimum pressure of cBN formation is 4.0 GPa.The present condition of cBN formation is clearly lower than theeutectic temperature of Li3BN2 and BN in the Li3N-hBN system(5.5 GPa, 1610°C). The content of cBN in the sample increases,while the content of hBN decreases with the temperature and pressure.The maximum conversion rate (5.0 GPa, 1500°C) is about 34%,which is higher than that in the hBN-Li3N system. The cBN crystals areoctahedral or tetrahedral in shape and approximately 20 μm in diameter.
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