Analysis of the direct transformation from graphite to diamond
Based on linear expansion coefficient and elastic constant, lattice parameters of diamond and graphite at high pressure and high temperature (HPHT) were calculated. The valence electron structures (VESs) of graphite, diamond and their common planes at HPHT were constructed according to the empirical electron theory in solid and molecules (EET). The electron densities continuity of graphite/diamond interfaces were analyzed on the basis of the boundary condition of the improved Thomas-Fermi-Dirac theory by Cheng. It was found that the electron densities of graphite/diamond interfaces during the course of diamond synthesis with catalyst were discontinuous at the first order approximation. The VESs of graphite, which satisfied the bond length difference formula in EET, did not exist under the conditions of detonation synthesis. It was considered that during the course of diamond synthesis with catalyst, the carbon source for diamond growth couldn ′t come from the graphite. The diamond synthesis under the detonation conditions wasn ′t due to the solid-solid phase transition between graphite and diamond
Bin Xu Bin Tian Musen Li Mei Wang
School of Materials Science & Engineering, Shandong Jianzhu University, Jinan 250101, China Shandong School of Materials Science & Engineering, Shandong University, Jinan 250061, China Shandong Enginee
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）