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摘要: 用二级轻气炮作为加载装置,测量了重水(D2O)的冲击压缩线,压力范围为10~43 GPa。用轴对称式电磁感应探头测量冲击波速度,测量精度约1.2%~1.5%。用电探针测量飞片速度,其精度约0.5%。用对比法原理进行测量,标准样品材料为无氧铜。实验发现,重水的冲击波速度随粒子速度变化呈斜率不同的两段直线关系,两线连结处出现拐折。分析认为,这一现象可能由液体D2O分子在冲击波作用下的离解过程引起。Abstract: Shock compression curve for heavy water (D2O) was measured in the range of 10~43 GPa by means of a two-stage light-gas gun. Shock velocities were measured to 1.2%~1.5% accuracy using the ASM probe. Impactor velocities were measured to 0.5% accuracy using an electric pin system with nanosecond time resolution. The shock impedance-match method was employed, in which the copper was used as standard. The results showed that two linear D-u fits were used to fit these data, and there exists a discontinuity between these two fits. This phenomenon may be ascribed to the dissociation of molecules of the heavy water.
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Key words:
- heavy water /
- shock compression /
- shock dissociation
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Wals J M, Rice M H. J Chem Phys, 1957, 26: 815. Hamann S D, Linton M. Trans Faraday Soc, 1966, 62: 2234. Mitchell A C, Nellis W J. J Chem Phys, 1982, 76: 6273. Nellis W J, Mitchell A C. J Chem Phys, 1980, 73: 6137. Marsh S P. LASL Shock Hugoniot Data. Los Angeles: University of California Press, 1980. Kell G S. J Phys Chem Ref Data, 1977, 6(4): 1114. Fritz J N, Morgan J A. Rev Sci Instrum, 1973, 44: 215. 经福谦, 等. 实验物态方程导引. 北京: 科学出版社, 1986. Hill P G, Chris MacMillan R D, Lee V. J Phys Chem Ref Data, 1982, 11(1): 1. Hamann S D, Linton M. Trans Faraday Soc, 1969, 65: 2186. Holmes N C, Nellis W J, Graham W B. Phys Rev Lett, 1985, 55: 2433. Eigen M, Demaeyer L. Proc R Soc London Ser A, 1958, 247: 505. Stillinger F H, David C W. J Chem Phys, 1978, 69: 1473. Belonoshko A, Saxena S K. Geochimica et Cosmochimica Acta, 1991, 55: 381.
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