摘要
采用固 液双相混合模型和分子流体的微扰变分统计理论 ,分别计算了石墨 水体系 (ρ0=1.2 33g/cm3)和金刚石 水体系 (ρ0 =1.2 38g/cm3)的冲击压缩特性。结果表明 :(1)在不发生石墨→金刚石相变和化学反应的低压区域 (p <2 0GPa) ,这两种混合体系的冲击压缩曲线的差别并不明显 ;(2 )在发生石墨→金刚石相变的高压区域 (p >2 0GPa) ,这两种混合体系的冲击压缩曲线显著不同 ,且石墨 水体系更易压缩 ;(3)在 4 5～ 60GPa强冲击压力范围内 ,冲击波诱发的化学反应也不会显著影响这两种体系冲击压缩曲线的走势。上述结论与文献 (高压物理学报 ,1999,13(2 ) :87 92 )发表的实验结果相矛盾。进一步分析了引起理论与实验结果不一致的可能原因 。
The Hugoniot curves of graphite-water and diamond-water mixtures, with the initial densities of 1.233g/cm3 and 1.238g/cm3 respectively, are calculated by use of the two-phase mixing model and the fluid-perturbation variational statistical theory. The results are: (1) The difference between the Hugoniot curves of these two mixtures is small below 20GPa where the graphite &rarr diamond phase transition and chemical reactions are supposed not to occur. (2) When the shock pressure is beyond 20GPa where the phase transition is considered to happen without any chemical reactions, these two curves are apparently different from each other, and the graphite-water mixture easier to be compressed. (3) The chemical reactions in these two mixtures at the pressure range of 45-60GPa will not change the trend of these two Hugoniot curves obviously. These conclusions are contrary to the experimental results published recently (in Chin. J. High Press. Phys. 13(2), p87). The reliability of the experimental data and the theoretical explanations in that paper are questioned.
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2001年第3期186-192,共7页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金资助 (5 9972 0 2 2 )
