The Generation of 90 GPa Quasi-Hydrostatic Pressures and the Measurements of Pressure Distribution
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摘要: 本文使用固态氩做传压介质，在自制的Mao-Bell型金刚石对顶砧装置中获得了90 GPa的准静水压。通过测量样品室内不同位置上红宝石荧光R1线的频移来确定压力分布。实验结果表明在80 GPa以下，样品室内不同位置上的压力与平均压力（p）的差p很小，最大的p/p不超过1.5%。在90 GPa时，红宝石的荧光R线与常压的很相似。这表明利用固态氩做传压介质可以获得接近100 GPa的准静水压。此外，对红宝石荧光光谱中位置在14 938 cm-1和14 431 cm-1两条谱线随压力的变化情况也作了讨论，并由此得出结论，14 938 cm-1这条线也可用来标定压力。Abstract: Quasi-hydrostatic pressures up to 90 GPa were obtained at room temperature in the diamond cell by using solid argon as pressure medium. The pressure distribution was determined by measuring the special shift of the R1 line of ruby at different positions within the sample chamber. Experimental results showed that the pressure differences (p) between the pressures at each point within the chamber and the mean pressure (p) were very small, ratios of p/p were less than 1.5% when below 80 GPa. The shape of ruby R lines at 90 GPa is similar to that at ambient pressure. Thus, quasi-hydrostatic pressure near 100 GPa can be obtained by using solid argon as pressure medium. Moreover, the red shifts with pressures of the peak positions at 14 938 and 14 431 cm-1 in ruby emission spectra, were also examined. It concluded that the line, 14 938 cm-1, can be adopted in the pressure calibration.
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Key words:
- quasi-hydrostatic pressure /
- argon /
- ruby R-line fluorescence
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Piermarini G J, Block S, Barnett J D. J Appl Phys, 1973, 44: 5377. Sharma S K, Mao H K, Bell P M. Carnegie Inst Washington Yearb, 1980, 79: 358. Bell P M, Mao H K. Carnegie Inst Washington Yearb, 1981, 80: 404. Zou G T, Mao H K, Bell P M. Carnegie Inst Washington Yearb, 1982, 81: 392. Mao H K, Xu J, Bell P M. J Geophy Res, 1986, 91: 4673. -
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