Thermodynamic Analysis of cBN Transformation in the Li3N-hBN System at High Pressure and High Temperature

doi:10.7503/cjcu20120630

Abstract

Abstract:

The possibility of several reactions at high pressure and high temperature was analyzed by the determinant method of ΔG<0 in second law of thermodynamics in the process of synthesizing cubic boron nitride(BN). The ΔG of reactions Li₃N+hBNLi₃BN₂, hBNcBN and Li₃BN₂Li₃N+cBN in the Li₃N-hBN system, was calculated in considering of the change of volume with temperature and pressure, under the synthetic condition of cubic BN. It was confirmed that Li₃BN₂ was synthesized with Li₃N and hexagonal BN in certain condition of high pressure and high temperature(T>1300 K and P>3.0 GPa). When temperature and pressure raise to the area of cubic BN(T=1600—1800 K and P=4.6—6.0 GPa), it was possible for two reactions Li₃BN₂Li₃N+cBN and hBNcBN in subregion of the P-T area in thermodynamics. However, the ΔG of hBNcBN was more negative than that of the former, and it was easier for the latter reaction. A preliminary discussion about the transition mechanism of cubic BN was made with the result of calculation.

Key words: High pressure and high temperature, Cubic BN, Thermodynamics, Gibbs free energy, Li₃BN₂

CLC Number:

O642

TrendMD:

YANG Hong-Mei, XU Bin, GUO Xiao-Fei, WEN Zhen-Xing, FAN Xiao-Hong, TIAN Bin. Thermodynamic Analysis of cBN Transformation in the Li₃N-hBN System at High Pressure and High Temperature[J]. Chem. J. Chinese Universities, 2013, 34(4): 970.

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Thermodynamic Analysis of cBN Transformation in the Li₃N-hBN System at High Pressure and High Temperature

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