New determination of the bismuth I-II equilibrium pressure: a proposed modification to the practical pressure scale
作者： I C Getting
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摘要: A new high-pressure instrument has been developed with the pressure uncertainty characteristic of free-piston gauges in 3000 MPa range. It consists an end-loaded piston-cylinder apparatus modified to use argon as a medium. Pressure is determined from piston force and seal area minor corrections for vessel bore dilation friction. Bore approximately 0.36% double-valued friction ranges about 1% 2%. force-balance analysis indicates that highly symmetric. The equilibrium Bi I-II transition this serve reference point on practical scale. Transition measurements were made 99.9999% pure polycrystalline bismuth. Small excursions both phases present determine which insensitive reaction rate. (2520 ± 5) at 25 C. This value 30 (1.2%) lower than Heydemann's [1] (2550 6) MPa. 8 (0.3%) higher (2512 3) Sekoyan et al. [2].
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