The near-Surface Region of Cubic Boron Nitride Single Crystal from the Li3N-hBN System
The near-Surface Region of Cubic Boron Nitride Single Crystal from the Li3N-hBN System
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Li3N-hBN 系统立方氮化硼单晶的近表面区域
DOI：
10.1088/0256-307x/31/4/048101
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发表时间：
2014
影响因子：
3.5
通讯作者：
Tian Bin
中科院分区：
文献类型：
--
作者：
Xu Bin;Wen Zhen-Xing;Fan Xiao-Hong;Tian Bin
以氮化锂为催化剂，在高温高压条件下合成了立方氮化硼单晶。在单晶周围的近表面区域中的主要相被确定为六方氮化硼（hBN）、立方氮化硼（cBN）和锂氮化硼（Li3BN 2）的混合物。高分辨透射电子显微镜观察表明，该区域存在大量的纳米级立方氮化硼晶核。用透射电镜研究了立方氮化硼晶体及其近表面区域的界面相结构。简要分析了立方氮化硼晶体的生长机理。认为Li_3BN_2作为真实的催化剂促进了hBN向cBN的直接转化，并且cBN在高温高压下在熔融状态下均匀成核。
Cubic boron nitride single crystals are synthesized with lithium nitride as a catalyst under high pressure and high temperature. The main phases in the near-surface region, which around the single crystal are determined as a mixture of hexagonal boron nitride (hBN), cubic boron nitride (cBN) and lithium boron nitride (Li3BN2). High resolution transmission electron microscopy examinations show that there exist lots of nanometer-sized cubic boron nitride nuclei in this region. The interface phase structures of cubic boron nitride crystal and its near-surface region are investigated by means of transmission electron microscopy. The growth mechanism of cubic boron nitride crystal is analyzed briefly. It is supposed that Li3BN2 impels the direct conversion of hBN to cBN as a real catalyst, and cBN is homogeneously nucleated in the molten state under high pressure and high temperature.