Data Tables for Primary Pressure Scale of KCl B2 Phase to the Core-Mantle Boundary.xlsx

Reliable pressure determination is crucial for high pressure and temperature experiments and meaningful interpretation of their geophysical implications. However, nearly all commonly-used pressure scales such as equation of states (EOS) on reference materials, Ruby fluorescence and diamond anvil Raman gauges are secondary in nature, meaning they were calibrated based predominantly on shock-compression-based pressure standards, which itself has substantial uncertainties. In this study, a self-consistent primary pressure scale of KCl B2 phase was experimentally calibrated up to 85 GPa at ambient temperature through simultaneously measuring the acoustic wave velocities and molar volume using Brillouin spectroscopy and Synchrotron X-ray diffraction (XRD). The resulted EOS, in combination with thermal pressure calculated using Mie‒Grüneisen‒Debye model enables accurate pressure determinations at simultaneously high pressure and temperature conditions up to Earth’s core-mantle boundary (CMB) and can serve as a benchmark for calibrating other secondary pressure scales.

在高压与高温实验中，可靠的压强测定至关重要，对于其地球物理意义的有意义解读亦不可或缺。然而，几乎所有常用的压强标度，如基于参考材料的方程状态（EOS）、红宝石荧光和钻石砧压砧拉曼测量仪等，本质上均为次级标度，这意味着它们的校准主要基于基于冲击压缩的压强标准，而这一标准本身存在较大的不确定性。在本研究中，通过同时测量声波速度和摩尔体积，利用布里渊光谱学和同步辐射X射线衍射（XRD），对KCl B2相的自洽一级压强标度进行了实验校准，直至85 GPa的常温条件。所得的EOS与使用Mie-Grüneisen-Debye模型计算的热压相结合，能够在同时达到高压力和高温条件下进行精确的压强测定，直至地球的地核-地幔边界（CMB），并可作为校准其他次级压强标度的基准。