钒的高压声速测量
Sound velo cities of vanadium under sho ck compression
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摘要: 采用反向碰撞方法进行了钒冲击实验,利用激光干涉测速技术对V/LiF窗口界面粒子速度剖面进行测量。通过对粒子速度剖面的分析获得了32-88 GPa压力范围内钒的高压声速。实验获得的声速-冲击压力关系在约60 GPa存在间断,表明钒发生了冲击相变。相变压力与静高压实验结果及第一性原理计算结果基本一致。Abstract: A series of reverse-impact experiments is performed on vanadium at peak shock pressures from 32 GPa to 88 GPa. A displacement interferometer is used to measure the particle velocity profile at the vanadium/LiF window interface. Analysis of these profile provides a measure of sound velocity of vanadium in the Hugoniot state. The transition from body-centered cubic structure to rhombohedral structure phase at ~ 60 GPa is identified by the discontinuity of the sound velocity against shock pressure. This transition pressure is consistent with the data from high pressure diamond anvil cell experiments and first-principle calculations.
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