高压低温条件下固态氩和4∶1甲醇-乙醇混合物传压介质的传压特性

 在高压低温（77 K）条件下，利用红宝石荧光测压方法，系统地研究了金刚石对顶砧装置中固态氩和4∶1甲醇-乙醇混合物的传压特性。通过测量不同位置上红宝石荧光R₁线的频移，确定了样品室内的压力分布。实验结果表明：在0~16 GPa的压力范围内，固态氩介质中反映介质非均匀性程度的|Δp/p|<3%、σ_p/p<2%，均在室温静水压条件下所允许的范围之内。红宝石荧光R线除随压力变宽外，与常压的很相似，表明固态氩在高压低温条件下是良好的传压介质。与之相比，4∶1甲醇-乙醇介质在77 K低温下的传压特性明显差于固态氩，已不适合作传压介质。

CHARACTERISTICS OF SOLID ARGON AND 4 : 1 METHANOL- ETHANOL MIXTURE AS PRESSURE-TRANSMITTING MEDIA UNDER HIGH PRESSURE AND LOW TEMPERATURE

Characteristics of solid argon and 4∶1 methanol-ethanol mixture were systematically studied by using ruby fluorescence technique under high pressure and low temperature (77 K) in the gasket diamond anvil cells. The pressure distribution was determined by measuring the special shifts of the R₁ line of ruby at different positions within the sample chamber. Experimental results showed that the values of |Δp/p| and σ_p/p which reflect the degree of inhomogeneity in solid argon medium are less than 3% and 2% in the pressure range from 0 to 16 GPa, respectively. Under high pressure, the shape of ruby R lines is similar to that at ambient pressure except for broadening with increasing pressure, which indicates solid argon is an excellent pressure-transmitting medium under high pressure and low temperature. On the other hand, the values of |Δp/p| and σ_p/p are larger than 3% and 2% in 4∶1 methanol-ethanol mixture, respectively, except for the initial pressure. Moreover, the shaper of ruby R lines at different positions are also different under higher mean pressures. These results indicate the methanol-ethanol mixture can not be used as a good pressure-transmitting medium under high pressure and low temperature.