Influence of the Strength of Materials on Pressure Calibration under Non-Hydrostatic Compression
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摘要: 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50 GPa。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。Abstract: 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 NaCl 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 NaCl as the sample materials.Therefore, the strength of materials has a great influence on pressure calibration under the non-hydrostatic pressure.
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图 3 不同加载下β-SiC、Pt和Au的原位X射线衍射谱
Figure 3. Integrated in situ XRD spectra of β-SiC, Pt and Au at various pressures
图 4 不同加载下NaCl、Pt、Au的原位X射线衍射谱
Figure 4. Integrated in situ XRD spectra of NaCl, Pt and Au at various pressures
图 5 不同加载步骤下β-SiC样品中Pt和Au压标的压力值
Figure 5. Pressure values of Pt and Au pressure marker in β-SiC sample at different loading steps
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