冲击加载下NaCl单晶高压声速与温度的同步测量  

Simultaneous Measurement of Sound Velocity and Temperature of Single Crystal NaCl under Shock Loading

作　　者：金柯[1] 吴强[1] 李加波[1] 周显明[1] 叶素华[1] 李俊[1] JIN Ke;WU Qiang;LI Jia-Bo;ZHOU Xian-Ming;YE Su-Hua;LI Jun(National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP ,Mianyang 621999, China)

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室,四川绵阳621999

出　　处：《高压物理学报》2017年第6期707-717,共11页Chinese Journal of High Pressure Physics

基　　金：国防基础科研计划(B1520110001)

摘　　要：基于二级轻气炮和多通道辐射高温计,测量了45~85GPa压力范围内NaCl单晶的B2相区、B2-液相混合相区和液相区的高压声速和温度。通过高压声速数据,确定了NaCl单晶的冲击熔化压力区间为58~67GPa。当压力为67GPa时,NaCl单晶的冲击熔化温度为3 740K。计算了NaCl单晶的等熵体模量、Grüneisen系数和定容比热容,对比分析了多种模型对Grüneisen系数高压演化特性的描述。结果显示,根据吴强模型计算的Grüneisen系数不但在液相区与冲击压缩实验结果吻合得非常好,而且在低压区也与金刚石压砧实验结果及有限应变计算结果吻合得非常好。Based on a two-stage light gas gun and a multi-channel time-resolved pyrometer,we simultaneously measured the shock temperatures and sound velocities of B2 ,B2-1iquid and liquid phase NaC1 single crystal in the pressure range from 45 GPa to 85 GPa. According to these sound velocities, the shock melting pressure region was determined to be 58-67 GPa, and the shock melting point obtained was 3 740 K at 67 GPa. Further- more, we calculated the isentropic bulk modulus, the Grtineisen parameter, and the specific heat capacity under constant pressure and compared the experimental results with the previously published data. The Grtineisen parameter calculated by Wuqiang model has an excellent agreement with both the shock compression experi- ment data in the liquid region and the diamond anvil cell experiment data and the finite strain theory calculation results in the low pressure region.

关 键 词：冲击加载 NACL 声速 冲击温度 Grüneisen系数 

分 类 号：O521.2[理学—高压高温物理] O521.3[理学—物理]