Pressure calibration to 20 GPa by simultaneous use of ultrasonic and x-ray techniques
Pressure calibration to 20 GPa by simultaneous use of ultrasonic and x-ray techniques
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DOI：
10.1063/1.1946905
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发表时间：
2005-07
影响因子：
3.2
通讯作者：
Baosheng Li;J. Kung;T. Uchida;Yanbin Wang
中科院分区：
文献类型：
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作者：
Baosheng Li;J. Kung;T. Uchida;Yanbin Wang
同时测量弹性P波和s波传播时间、密度（比体积）和样品长度，使用超声干涉测量、x射线衍射和射线照相相结合的多顶台设备，可以同时测定高压和高温下的弹性特性和绝对压力。实验程序和数据分析使用收集的数据在准流体静力条件下高达20GPa的硅酸铁（MgFe）和wadsleyite Mg2SiO4的多晶样品进行演示。与同一实验中基于NaCl状态方程得到的内压标准相比，20GPa下直接测定的压力分别比Brown和Decker压力标度推断的压力高~ 8%和~ 12%。NaCl压力标度和现有实验数据的不确定性无法调和这种差异。在得到进一步的结果之前，这项研究确定的压力被认为是…
Simultaneous measurements of elastic P- and S-wave travel times, density (specific volume), and sample length using a multianvil apparatus interfaced with ultrasonic interferometry and x-ray diffraction and radiography have enabled simultaneous determination of elastic properties and absolute pressure at high pressures and high temperatures. Experimental procedures and data analyses are demonstrated using data collected on polycrystalline samples of ferropericalse (MgFe) and wadsleyite Mg2SiO4 under quasihydrostatic conditions up to 20GPa. Compared with those derived from the internal pressure standard in the same experiments based on equations of state of NaCl, the directly determined pressure at 20GPa is ∼8% and ∼12% higher than those inferred from the Brown and Decker pressure scales, respectively. The discrepancy cannot be reconciled by uncertainties in the NaCl pressure scale and current experimental data. Until further results are available, the pressure determined in this study is believed to be a ...