冲击加载下硅烷流体的导电特性研究
Research on Electrical Conductivity of Silane Fluid Under Multiple Shock-Compression

采用二级轻气炮加载技术，结合低温靶和光电监测技术，研究了在多次冲击压缩状态下液态硅烷的导电特性。本文在7―56GPa压力区间获得了一组新的电阻率数据点，并结合在高压区(65―108GPa)已发表的电阻率数据，在更宽压缩区间(7―108GPa)给出了硅烷流体电阻率随压力的变化规律。结果表明，硅烷流体在7―41GPa之间具有较好电绝缘性，但在41―52GPa之间电阻率从约150Ωcm迅速下降到约1Ωcm，其降幅达到两个数量级。当压力从52GPa进一步升高到108GPa，硅烷流体的电阻率再降低了近5倍，但与低压段相比电阻率随压力变化的速率明显减小。分析lnρ~P图中数据点分布特征发现在52GPa附近出现明显拐折点。据此推测硅烷流体在该压力附近可能发生了结构相变。
Two-stage light-gas gun, combined with the cryogenic target and photoelectric measurement technique, is used to study the electrical conductivity of silane fluid under multiple shock compression. A group of new conductivity data in the pressure range of 7-56GPa are obtained, and the pressure dependence of electrical resistivity in wider compression is plotted, together with the previously published data with the pressure of 65-108GPa. The results show that the silane fluid has good electrical insulation in 7-41GPa, but in 41-52GPa its resistivity is reduced by two orders of magnitude, from nearly 150Ωcm to about 1Ωcm. When the pressure increases from 52GPa to 108GPa, the resistivity continues to decrease by nearly 5 times. In lnρ~P plane, date point distribution shows that there exists a turning point at about 52GPa, and it suggests that a structural transformation may occur in silane fuid at 52GPa.