The triple point of xenon.
The triple point of xenon.
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DOI：
10.1088/0026-1394/42/4/013
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发表时间：
2005-08-01
期刊：
影响因子：
2.4
通讯作者：
Steele, AG
中科院分区：
文献类型：
--
作者：
Hill, KD;Steele, AG
氙的三相点被证明是一个合适的固定点，可以纳入下一个修订的国际温标（ITS），作为减少重要的84 K至273 K范围内的非唯一性的一种手段。曾经被认为是限制因素的同位素效应被证明是可以忽略不计的。纯度仍然是最重要的问题，但高纯度的氙气是可以获得的，在+/- 10 μ K范围内，熔化范围从50%到90%的熔化样品分数，提供了一个非常平坦的平台。氙的三相点温度在ITS-90上显示为161.40596 +/- 0.32 mK （k = 1）。铂电阻温度计的传播校准不确定度和ITS-90的非唯一性所导致的组件，如7个校准温度计之间的差异所证明的那样，主导了估计三相点温度的总体不确定度。氙三相点本身具有高度可重复性，本研究的8个熔体的标准偏差为48 μ K，实现的总不确定度仅为76 μ K。
The triple point of xenon is shown to be a suitable fixed point for incorporation into the next revision of the International Temperature Scale (ITS) as a means of reducing the non-uniqueness in the important 84 K to 273 K range. Isotopic effects, once thought to be a limiting factor, are shown to be negligible. Purity remains the overriding concern, but high-purity xenon gas is obtainable, giving a very flat plateau with a melting range within +/- 10 mu K from 50% to 90% of the melted sample fraction. The triple point temperature of xenon is shown to be 161.40596 +/- 0.32 mK (k = 1) on the ITS-90. The propagated calibration uncertainty of the platinum resistance thermometers and the component attributed to the non-uniqueness of the ITS-90, as evidenced by the differences among the seven calibrated thermometers, dominate the overall uncertainty of the estimated triple point temperature. The xenon triple point itself is highly reproducible, with a standard deviation of 48 mu K for the eight melts of this study and a total realization uncertainty of just 76 mu K.