Preliminary Measurements of the Xenon Triple Point
Preliminary Measurements of the Xenon Triple Point
复制标题
氙三相点的初步测量
DOI：
10.1007/s10765-014-1580-x
复制
发表时间：
2014
影响因子：
2.2
通讯作者：
D. Giraudi
中科院分区：
文献类型：
--
作者：
P. Steur;D. Giraudi
自从1990年国际温标（ITS-90）的建立和定义以来，人们已经认识到该温标的一个严重缺陷，但没有可靠的补救措施。问题是，当时氩三相点和水三相点之间唯一可用的高质量固定点是汞三相点，不幸的是，汞三相点非常靠近水三相点，因此对SPRT在该范围内的插值函数有非常强的影响。早在1990年之前，就已经研究了在这个温度范围内更好地放置可能的固定点的测量，例如氪和氙的三相点。然而，结果是相当难以捉摸的，主要是关于他们的过渡相当大的熔化范围。一个转折点是2005年国家研究理事会（NRC，加拿大）的论文，其中确定了相对高的氪含量是之前发表的氙跃迁大熔化范围的罪魁祸首。事实上，对氪含量非常低的氙样品进行测量，产生了一个非常高质量的平台，与其他ITS-90固定点相同。但是，没有报告随访测量结果，因此也没有报告比较测量结果。在NRC论文发表后不久，国家计量科学研究所（意大利INRIM）获得了一批与NRC使用的相同的高纯度氙，目的是用它制备一些密封的电池，并试图重现NRC的结果。然而，随着氖项目（Euromet项目770）的开始，这些意图的实现不得不推迟到现在。去年12月，三个不同设计的细胞已充满这种高品质的氙和测量的三相点的初步结果的报告。
Ever since the construction and definition of the highly successful International Temperature Scale of 1990 (ITS-90), one severe deficiency of the scale has been recognized, without a reliable remedy. The problem is the fact that the only then available high-quality fixed point between the argon triple point and the water triple point was the mercury triple point, which unfortunately is situated rather closely to the water triple point, thus having an extremely strong influence on the interpolation function of SPRTs in therange. Already before 1990, measurements on possible fixed points better placed in this temperature range have been investigated, such as the triple points of krypton and xenon. However, results have been rather elusive, mainly regarding the rather large melting range of their transition. A turning point was the 2005 paper from the National Research Council (NRC, Canada), where it was established that the relatively high content of krypton was the culprit for the large melting range of the xenon transitions published previously. Indeed, measurements on a xenon sample with very low krypton content produced a very high-quality plateau, of the same level as other ITS-90 fixed points. However, no follow-up measurements have been reported, and thus neither have comparison measurements been reported. Shortly, after the appearance of the NRC paper, Istituto Nazionale di Ricerca Metrologica (INRIM, Italy) acquired a batch of the same high-purity xenon as used by NRC with the aim of preparing a few sealed cells with it and trying to reproduce the NRC results. However, with the start of the Neon Project (Euromet Project 770), the realization of these intentions had to be postponed until now. Last December, three cells of different design have been filled with this high-quality xenon and preliminary results of the measurements on the triple point are reported.