A Revised Ruby Pressure Scale up to 160 GPa
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摘要: 在同一理论框架内,基于冲击Hugoniot和热力学参数计算了Al、Cu、W、 Au、Pt、Ta、Ag、Mo、Ni、Co和Zn的300 K等温压缩线,并结合现有静高压实验数据,在160 GPa压力范围内重新标定了红宝石压标。所采用的两种红宝石压标形式的标定结果分别为A=1 923.4 GPa、B=9.75和m=1 889.0 GPa、n=5.48,两者具有非常好的自洽性,200 GPa压力范围内确定的压力偏差小于2.1 GPa。基于提出的红宝石压标,重新计算了3组Au等温压缩实验的加载压力。固定等温体模量为167 GPa,重算的实验数据拟合至Vinet物态方程所得等温体模量对压力的一阶偏导为5.95,与超声实验数据非常吻合。Abstract: The ruby pressure scale is revised using available static compression data of eleven markers at pressures up to 160 GPa, which includes Al, Cu, W, Au, Pt, Ta, Ag, Mo, Ni, Co, and Zn. The shock wave reduced isotherms of these markers are derived from shock Hugoniot and thermodynamic data using the same theoretical framework. These isotherms are then used to calibrate the ruby pressure scale, which shows good consistency based on simultaneous volume measurements. The calibration was processed by fitting all of these data to two ruby pressure scale forms, and gives the parameters A=1 923.4 GPa, B=9.75, and m=1 889.0 GPa, n=5.48, respectively. These two sets of ruby pressure scale differ by less than 2.1 GPa in the pressure range of 200 GPa. Making use of our ruby pressure scale in latter form, the static compression data of Au are reassessed. When the bulk modulus is fixed at 167 GPa, fitting the reassessed pressure-volume data to Vinet -equation-of state gives the first order pressure derivative of bulk modulus as 5.95, which has an excellent agreement with ultrasonic measurements.
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Key words:
- equation of state /
- pressure scale /
- ruby
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