Abstract
At the former IMGC-CNR (now INRiM), the Italian national metrological Institute, a series of pure hydrocarbons were measured in past years to determine with high accuracy for the temperature of their triple point and of their solid-to-solid transition(s) when present. While results on methane, ethane, and propane were published; the 1982 measurements on n-butane were never so far. It seems useful to add these results now to the still scarce existing data for possible inclusion in reference data archives. The paper summarises the experimental setup and results, compared with previous determinations. For the triple point, a temperature Ttp,90 = 134.869(2) K was found showing a higher accuracy. For the s.s.t.-I, the temperature was T90,upper-end = 108.2(3) K, where the low accuracy is due to the peculiar s.s.t. properties.
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Data Availability
Dataset: F. Pavese (1982). Author Archives. Available, on request to the Author, only in graphical form: chart registrations with handwritten info and comments.
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Pavese, F. The Triple Point and Solid-to-Solid Phase Transition at ≈ 107 K of n-Butane. Int J Thermophys 44, 119 (2023). https://doi.org/10.1007/s10765-023-03228-9
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DOI: https://doi.org/10.1007/s10765-023-03228-9