摘要The black cubic boron nitride (cBN) single crystal is synthesized by using hBN-LiH and hBN-Li3N−B as the raw materials at high temperature and high pressure (HTHP). The colors of the cBN crystal synthesized in an hBN-Li3N−B system vary from transparent yellow, half-transparent and then opaque black with the increasing B content in the raw materials. It is worth noting that a trigonal shadow is presented at the center of the cBN crystal synthesized in the hBN-Li3N-B system but can not be found in the hBN-LiH system. Analyzing the Raman spectrum, we find that the darkening and the trigonal shadow in the cBN crystal may be due to the presence of excess B atoms. The above-mentioned phenomenon can be determined by removing impurity capacity and growth environment of the cBN crystal.
Abstract：The black cubic boron nitride (cBN) single crystal is synthesized by using hBN-LiH and hBN-Li3N−B as the raw materials at high temperature and high pressure (HTHP). The colors of the cBN crystal synthesized in an hBN-Li3N−B system vary from transparent yellow, half-transparent and then opaque black with the increasing B content in the raw materials. It is worth noting that a trigonal shadow is presented at the center of the cBN crystal synthesized in the hBN-Li3N-B system but can not be found in the hBN-LiH system. Analyzing the Raman spectrum, we find that the darkening and the trigonal shadow in the cBN crystal may be due to the presence of excess B atoms. The above-mentioned phenomenon can be determined by removing impurity capacity and growth environment of the cBN crystal.
(State selected dynamics and product distribution)
引用本文:
JI Xiao-Rui**, YANG Xiao-Hong. Removing Impurity of cBN Crystal Prepared at High Pressure and High Temperature[J]. 中国物理快报, 2012, 29(3): 38101-038101.
JI Xiao-Rui, YANG Xiao-Hong. Removing Impurity of cBN Crystal Prepared at High Pressure and High Temperature. Chin. Phys. Lett., 2012, 29(3): 38101-038101.
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