Pressure calibration based on the ultrasonic measurement in multi-anvil apparatus

Pressure calibration based on the ultrasonic measurement in multi-anvil apparatus
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多砧仪中基于超声测量的压力校准

DOI:
10.1080/08957959.2020.1863398
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发表时间:
2020-12
影响因子:
2
通讯作者:
Yonggang Liu
Yonggang Liu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Wei Song;Qizhe Tang;Chang Su;Xiang Chen;Yonggang Liu

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本文报道了两种在多砧装置上通过测量纵波传播时间与压力的函数关系来校准压力至4.4GPa的超声测量方法。第一种方法是通过将测量的Z切石英在静水压力下的走时与石英的相关状态方程和晶胞参数相结合来连续标定压力。第二种方法是定点校准,这是通过测量纵波旅行时间的突变来校准压力,因为本研究中使用的样品,H2O,Hg和Bi将在室温下经历压力诱导相变。这两种方法的实验结果是一致的。从这项研究中获得的石英压力表表示为P(GPa)= 28.7(1-tp/tp 0)。这两种超声波测量方法可能是互补的手段,压力校准的情况下,其他探头的方法是不方便。
Two ultrasonic measurement methods for pressure calibration to 4.4 GPa in a multi-anvil apparatus by measuring the travel times of longitudinal wave as a function of pressure are reported. The first method is to continuously calibrate pressure by combining the measured travel times of Z-cut quartz under hydrostatic pressure with the related equation of state and unit-cell parameters of quartz. The second method is fixed-point calibration, which is to calibrate the pressure by measuring the abrupt change of the longitudinal wave travel times since the samples, H2O, Hg and Bi used in this study will undergo pressure-induced phase transitions at room temperature. Experimental results of these two methods are in good agreement. The quartz pressure scale obtained from this study is expressed asP(GPa) = 28.7(1−tp/tp0). The two ultrasonic measurement methods might be complementary means for pressure calibration in situations where other probe method is not conveniently available.
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