非静水压下材料强度对压力标定的影响

Influence of the Strength of Materials on Pressure Calibration under Non-Hydrostatic Compression

采用金刚石对顶砧压腔和同步辐射X射线衍射技术研究了非静水压下材料强度对压力标定的影响。实验中,在同一个高压腔中用Pt和Au作为压标进行压力标定比较。Pt标定腔内压力,分别将Au与β-SiC和NaCl粉末混合,压力均加载到50GPa。结果表明:当使用β-SiC作为样品材料时,Pt标定的压力和Au标定的压力出现了比较大的差别;当使用NaCl作为样品材料时,Pt标定的压力和Au标定的压力十分接近。说明在非静水压下,样品材料强度对于压力标定有很大的影响。

In this paper, we carried out experimental studies on the influence of the strength of materials on the pressure calibration under non-hydrostatic compression using the diamond anvil cell and synchrotron radiation X-ray diffraction technology. Pt and Au were used as the pressure marker in the same high pressure cavity. Pt calibrates the cavity pressure,and Au mixed with β-SiC or NaCl powder calibrates the pressure of β-SIC and NaCI powder. The pressure was loaded to 50 GPa, respectively. Our experimental results indicate that the calibrated pressures of Pt and Au show a large difference when using the β-SIC as the sample material, whereas the calibrated pressures are close when using NaCI as the sample materials. Therefore, the strength of materials has a great influence on pressure calibration under the non-hydrostatic pressure.