High-Pressure Sound Velocity Measurements of Liquids Using In Situ Ultrasonic Techniques in a Multianvil Apparatus
High-Pressure Sound Velocity Measurements of Liquids Using In Situ Ultrasonic Techniques in a Multianvil Apparatus
复制标题
在多砧装置中使用原位超声波技术测量液体的高压声速
作者：
Z. Jing;Tony Yu;Man Xu;J. Chantel;Yanbin Wang
声速和液体的状态方程提供了重要的限制在地球内部的硅酸盐和金属熔体的产生，存在和运输。与其固体对应物不同，液体的这些性质对高压测量提出了巨大的技术挑战，并且受到很大的限制。在这里，我们提出的技术发展，已在GSECARS光束线13-ID-D的先进光子源在过去几年中使用超声波技术在1000吨河井型多砧装置测定液体的声速。声速测量的温度已扩展到~2400 K（4 GPa）和~2000 K（8 GPa），以研究具有非常高熔融温度的液体，如硅酸盐液体。
Sound velocity and equation of state of liquids provide important constraints on the generation, presence, and transport of silicate and metallic melts in the Earth’s interior. Unlike their solid counterparts, these properties of liquids pose great technical challenges to high-pressure measurements and are poorly constrained. Here we present the technical developments that have been made at the GSECARS beamline 13-ID-D of the Advanced Photon Source for the past several years for determination of sound velocity of liquids using the ultrasonic techniques in a 1000-ton Kawai-type multianvil apparatus. Temperature of the sound velocity measurements has been extended to ~2400 K at 4 GPa and ~2000 K at 8 GPa to enable studies of liquids with very high melting temperatures, such as the silicate liquids.