Nanothermodynamic analysis of the low-threshold-pressure-synthesized cubic boron nitride in supercritical-fluid systems

被引:10
作者
Wang, CX [1 ]
Yang, YH [1 ]
Yang, GW [1 ]
机构
[1] Zhongshan Univ, Sch Phys Sci & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China
关键词
D O I
10.1063/1.1713029
中图分类号
O59 [应用物理学];
学科分类号
摘要
A thermodynamic model in nanoscale was developed to elucidate the nucleation of the cubic boron nitrides (c-BN) synthesized in the high-pressure and high-temperature (HPHT) supercritical-fluid systems under the conditions of the low-threshold-pressure (from 2.0+/-0.1 to 3.0 GPa) and low-temperature (1300-1500 K). Notably, taking the nanosize-induced interior pressure into account, the nucleation of c-BN could be driven to the new stable region from the metastable region in the general accepted equilibrium phase (P,T) diagram of BN proposed by Corrigan and Bundy, upon HPHT supercritical-fluid systems. The threshold pressure of the formation of c-BN was calculated based on our model, and these results are in excellent agreement with the experiment. (C) 2004 American Institute of Physics.
引用
收藏
页码:3034 / 3036
页数:3
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