A method for simultaneous measurements of compressional wave and shear wave velocities in rocks and minerals at high pressure and high temperature: A modification to the combined transmission-reflection method

IF 1.1 4区工程技术 Q4 Engineering High Temperatures-high Pressures Pub Date : 2022-01-01 DOI:10.32908/hthp.v51.1249

Wei Song, Qizhe Tang, Chang Su, Xiang Chen, Yonggang Liu

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Abstract

We present a modification to the combined transmission-reflection method, which is frequently used to measure the elastic wave velocities in rocks and minerals at high pressure and high temperature in multi-anvil apparatus. The modification mainly focuses on the adoption of dual-mode ultrasonic transducer and new backing reflector (a molybdenum foil), the former was used to simultaneously measure the travel times of compressional wave and shear wave in the sample, and the latter was used to intensify the reflection signals of the buffer rod. The correction time of the molybdenum foils was determined using the equation of state and highpressure velocities of molybdenum. In addition, the length change of sample under high pressure was also taken into account. Using this method, we simultaneously measured the compressional wave and shear wave velocities in Z-cut a-quartz single crystal to 2 GPa at room temperature, and natural mafic granulite sample to 1.4 GPa and 500�C in a multianvil apparatus. The results of this work agree well with those of previous measurements and demonstrate the feasibility of this new method. We believe that by using this method, more accurate elastic properties of rocks and minerals under high pressure and high temperature can be obtained, especially Poisson�s ratio.

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在高压和高温下同时测量岩石和矿物中纵波和横波速度的方法:对透射-反射联合法的改进

本文对多砧测井仪中常用的测量岩石和矿物在高压高温下的弹性波速的联合透射-反射法进行了改进。改进主要是采用双模超声换能器和新型背衬反射器(钼箔)，前者用于同时测量样品中纵波和横波的传播时间，后者用于增强缓冲棒的反射信号。利用状态方程和钼的高压速度，确定了钼箔的校正时间。此外，还考虑了试样在高压下的长度变化。利用这种方法，我们在多砧仪器中同时测量了z -切割石英单晶在室温下2 GPa的纵波和横波速度，以及天然基性麻粒岩样品在1.4 GPa和500℃下的纵波和横波速度。所得结果与以往的测量结果吻合较好，证明了新方法的可行性。我们相信，用这种方法可以得到更精确的岩石和矿物在高压和高温下的弹性特性，特别是泊松比。

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来源期刊

High Temperatures-high Pressures THERMODYNAMICS-MECHANICS

CiteScore

1.00

自引率

9.10%

发文量

期刊介绍： High Temperatures – High Pressures (HTHP) is an international journal publishing original peer-reviewed papers devoted to experimental and theoretical studies on thermophysical properties of matter, as well as experimental and modelling solutions for applications where control of thermophysical properties is critical, e.g. additive manufacturing. These studies deal with thermodynamic, thermal, and mechanical behaviour of materials, including transport and radiative properties. The journal provides a platform for disseminating knowledge of thermophysical properties, their measurement, their applications, equipment and techniques. HTHP covers the thermophysical properties of gases, liquids, and solids at all temperatures and under all physical conditions, with special emphasis on matter and applications under extreme conditions, e.g. high temperatures and high pressures. Additionally, HTHP publishes authoritative reviews of advances in thermophysics research, critical compilations of existing data, new technology, and industrial applications, plus book reviews.