快速增压法研究温度对铝和氯化钠Grüneisen参数的影响  

Effect of Temperature on Grüneisen Parameters of Aluminum and Sodium Chloride by Rapid Compression Method

作　　者：王君龙[1] 刘秀茹[1] 张林基 何竹[1] 洪时明[1] WANG Junlong;LIU Xiuru;ZHANG Linji;HE Zhu;HONG Shiming(School of Physical Science and Technology,Key Laboratory of Advanced Technologies of Materials,Ministry of Education of China,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院,材料先进技术教育部重点实验室,四川成都610031

出　　处：《高压物理学报》2018年第4期22-29,共8页Chinese Journal of High Pressure Physics

基　　金：中央高校基本科研业务费资助课题(2682016CX065,2682014ZT31)

摘　　要：根据Grüneisen状态方程导出的偏导关系式γ=(K_S/T)(T/p)S(其中KS是绝热体积弹性模量),采用快速增压方法结合中值定理分别在297~494K和312~608K温度范围内研究了铝和氯化钠的Grüneisen参数γ随温度的变化关系。在平面对顶压砧模具上设计了内加热的样品组装方式,测量了不同温度下快速增压过程中样品的温升曲线和压力变化曲线,并对温升曲线进行了温度修正,使所得结果更接近绝热压缩过程。实验结果表明:铝和氯化钠在实验温度范围内、压力分别为2.17GPa和1.46GPa下,其ΔT/Δp值随着温度的升高而增大;γ值随着温度的升高表现为波动的变化趋势,与温度没有明显的变化关系。In this work,we measured the Grüneisen parameter γ of aluminum in 297 - 494 K under 2.17 GPa and the γ of sodium chloride in 312 - 608 K under 1.46 GPa,based on the Grüneisen differential equation γ=（K S /T）（ T/ p） S （where K S is the adiabatic elastic bulk modulus）,combining the rapid compression method with the mean value theorem.A setup for internal heating was designed to produce high temperature in the sample chamber and the rapid compression on sample at different temperatures was carried out in a Bridgman anvil by a self-made rapid compression apparatus.The curves of temperature and pressure rise of the sample were recorded during rapid compression.For compensating the heat loss due to heat conduction,the temperature-rise curve was modified according to the cooling rate of the sample during the pressure-holding process.The temperature-rise curve after compensation is closer to that of adiabatic compression.It was found that for aluminum under 2.17 GPa and sodium chloride under 1.46 GPa,the Δ T /Δ p increases with the increasing temperature while the Grüneisen parameters fluctuate,showing no obvious relationship with temperature in the experimental temperature range.

关 键 词：Grüneisen参数 高温高压 快速增压 氯化钠 铝 

分 类 号：O522.2[理学—高压高温物理] O521.22[理学—物理]